Just because @James had asked us the same about voxel games, here now the questions about MMOs you play/have played and how that may help the devs to make Oort Online to a even better gaming experience 
So here are the Questions:
1.: What other MMO(s) do you play/have played?
2.: What do they right?
3.: What do they wrong?
4.: What can Oort Online learn from them?
Hope we can get some nice inspirations
1: Mabinogi, a personal favorite. Most people get turned off by the character models I think, but otherwise it is a superior MMO.
2: Combat is strategic and not smash all your skill buttons. Customization is insane, I guarantee you wonāt look like someone else unless you are a totally new player or you are doing it on purpose.
3: Itās all about the micro transactions, seriously I buy something almost every 3 months.
4: Donāt make me pay anymore please, sell me a T-shirt or a 3d model of my own character, but please donāt encourage me to pay hundreds after Iāve already bought the game.
For me, I have some mayor gaming experiences with MMOs. Here they are ā¦
GUILD WARS 1
Right: Guildwars had only a limit of 8 Skills you can use at once. You could lern hundreds but have to chose 8 to take into your bar. On this way there where many different styles of gameplay. It also was very teambased through the limited skill use and the enviroment was made to be conquered in groups (you could take NSCs with you if you not got to 4-8 ppl). Enemies also had 4 or more skills (many of them the same that players can learn), used them smart and were acting mainly in mixed groups so then encounters were feeling like a real match of two parties fighting each other. Also, through the possibility to mix classes and change the second class freely, everyone could lern every skill (only few were only good for only the main-class of the character).
Special effects on items were nice, but not gamechanging (for example: The most loved effects on a weapon were 20% armor penetration on every 5th hit or +30 life (was about 5-7% of normal max life) . Also, everyone could get āmaxedā items very quick, so skill was more important than equip.
And at last, GW was highly using conditons, interrupts and combinations of effects. So there were many players who had 2-4 of there skills with interrupts to lame down enemy healers or casters, which was important. Also the conditions were very strong, ranging from bleeding or burning damage over slowdowns, confusion (lower casting speed), poisoning, weakness (lower attack power), deep wounds (max health reduced) and blindness (+some others). Some skills were functioning better on special conditioned enemies, so if you took a heavy swing on an slowed enemy the skill could knock hin down or a bleeding enemy could get interrupted or slowed down. So if the group used good combinations there were many powerful ways of interaction.
Wrong: No open world outside of cities and outposts. It was good for the conzept, but so the game felt empty sometimes. Many people were overwhelmed by the number of skills to chose from
To learn from: Limited number of equipable skills at once (may be through item slots) but many different skills/items to chose from. let there be skills that interact (for example: One slows the enemy, another one stuns a slowed one or let them bleed. ā¦ Let enemies have some skills to let them feel more versatile. 2 or 3 per Creature would be cool. ā¦ Let item bonuses be good, but donāt let them get to powerful compaired to ālowerā ones. This would lead to be good by being a skilled player. ā¦ let there be some nice conditions or effects that we can put in enemies (or they to us) for enrich the combat experience. Let there be reduced armor through acid or weakening effects. Blindness would also be cool if it is a real visible effect. Also, let the effects not be only for some few seconds. ā¦ May be skills have a using time of 0,5 - 1,5 seconds so that there is a way to interrupt or avoid them.
WILDSTAR
Right: skills used areas of effect, even melee skills, and you also saw that effect of incoming enemy attacks. The Housing was interesting, cuz furniture gave a bonus on the relexing-bonus (which was an ep+ bonus in the game). It also had spots for farming or partying ^^. There were items you could use on your equipment to give bonuses to them (slight ones). It also had only a limit of 7 skills to put on at the same time. Also, the enemies had nice skills, but only 1 or 2. REEEEAAL Cool Boss fights in dungeons or raids.
Wrong: To class based gameplay. Only 30 skills per class. Dead because they didnāt listened to the community (or just to late)
Learn from: The possibility to upgrade items (may be ābetterā later equip has a slot for a special gem to add) ā¦ The comfort bonus through good furniture, light in the home or other special circumstances at your beacon where you are logging off or stay for longer. What bonus we will get through it would be your choice, devs 
ā¦ Also the enemies and their tactics are inspirational. The Bosses may be good examples for titans
WOW
Good: Masive World with a lot of lore. Home areas for the races and their own capitals. Nice sum of pets and mini pets. The rest is quite bad ^^
Wrong: Equip is to important for the power of a character ā¦ Skill Spamming ā¦ no variation in gameplay for different builds for the same (sub-)class. ā¦ Enemies where uncreative (only some bosses were nice made). ā¦ Being able to solo areas/dungeons/raids ment for lower players.
to learn from: NO SOLOING on titans and harsh dungeons (even for lower people). May be there is a adjustment for higher people visiting lower worlds. ā¦ NO to powerful equipment. Let new equipment have new effects or skills, but only slightly better stats. ā¦ NO Skillspaming ā¦ NO dump Mobs. ā¦ And now to the Pros ^^: May be there could be a home world for each race. ā¦ Let their be a lot of lore about the lands and the history ā¦ let there be many different animals not only for herding, but also tamable (with different attack skills on each one)
Finiiiiiished!
PS: Nearly forgotten: THE SECRET WORLD
right: Skill wheel with every character able to learn all the skills ingame (but with a lot of work ^^). Coool atmosphere, story and screenplay. 3 DIfferent factions with own aims (that were handled my faction based quests and missions.
wrong: Combat was to strafing intensive. Mobs where just ok. Ranged combat was nearly impossible if all was running up to you ^^
learn from: Everyone should be able to lern and master everything, but only with a lot of effort to do that. Factions are a good idea to think about (if it would fit into the lore and game mechanics). May be Dungeons (if there are some) can feel a bit creapy trhough fog, sounds and strange (and may be surprising) creatures
Warning: The following post is a representation of this posterās views, they are not stated facts, just opinions.
I donāt think I could list every MMO Iāve played on this post.
) When I did end up paying the subscription it was an even better game, tons of quests that werenāt āKill X amount of monsters, report to So-and-So, etc.ā they actually made you think sometimes, maybe they even challenged you with combat, and they were somehow connected with each other within the lore which I didnāt read even though I roleplayed.(Wellā¦ I used quest guides online for 75% of the quests, but you get what I mean.) I remember when they introduced the Grand Exchange, that thing was like a work of God, you didnāt have to gather in a trading world in one spot and spam what you are selling and buying (And possibly get scammed if you donāt pay attention.), you could just go to the GE and look up or place an item then set your price and walk away and wait for someone to sell or buy the item.(I also remember being so scared of saying that I was selling something that Iād just sit there and wait for someone to say they are buying.) When the EOC update came it made combat feel less RNG based since you could actually use abilities instead of click and wait.Iāll just finish my post here because it seems pretty long, I can make more posts about other games Iāve played if you guys want.
Edit: I shouldnāt call Jagex a bad word.
Or protectors people keep forgetting these 
i can remember a ton and have played even more. i will write the long version when i get home.
but to mention what i am going to go around:
ESO
Wildstar
Trove
TSW
GW2
Tera
and some different others as i go around such as blade and soul which i dabbled in, and then a few others which i cannot remember atm.
Actuall Iāve played a lot of games in my short life already, and none of them really satisfied me ^^
Iām very pick about a looot of things, thats because Iām an ā ā ā ā ā ā ā perfectionsit. So I canāt really tell what Oort can learn of other Games and I dont think tha a Game will ever satisfy me at all, not even if I would make an own ^^
But there are many cool things out there that could be implemented, I think Oort Online can learn from a lot of Games, I just cant name anything cause Iām always just plying and not paying attention to such spesific Things. Good that others give good suggsestions 
Asheronās Call, I & II
Done right: seamless world. Character progression and skill building Player housing with different options.
Done wrong: It became difficult after a few years to make things challenging without going to the nuclear option. PVPāit was all griefers. There was no point in starting a characterāyouād be dead and naked after two seconds on the PVP server. Lesson learned: a PVP system must have penalties for powerful characters who prey too far below their level. (That means instigateāif you want to attack someone +10, go right ahead.)
City of Heroes/Villains
Done right: Just about everything. Character progression wasnāt on railsāyou could choose your own story. The replay value was huge because the powers and crafting were very well balanced.
Done wrong: End game, such as it was. Too repetitious and no clear sense of a goal.
Star Trek Online
Done right: Handling the intellectual property. Character progression.
Done wrong: End game is just DPS, DPS, DPS. The third owner is trying to monetize it to death after converting to F2P and the end-result is power-creep, leading to DPS, DPS, DPS. Me, I like exploring and building. Itās nice that things explode, but Star Trek wasnāt about making things explode. Honor the property, I say.
Earth and Beyond
Done right: Explorationāit was a big galaxy and exploring it brought character advancement benefits.
Done wrong: Starbases too small. Not enough time spent on planetsājust space, space, space. Economy was never given time to develop. It died an early death by allowing too much pre-release advancement among the beta-testersāthe galaxy couldnāt be made big enough fast enough to keep everyone engaged.
Dark Age of Camelot
Done right: Honestly, I donāt remember liking it enough to think anything was done right.
Done wrong: Entirely player-based economy. The world was too-obviously bounded. The first 50 levels were nothing but prelude to the end-gameāwhatever it was, because I couldnāt stay interested enough to get there. I do remember that all the guilds I saw seemed to think they were either cults or the military, neither of which are particularly good models for in-game participation.
DC Universe Online
Done right: Graphics are very well done.
Done wrong: Character creation. Combat system. Itās a console twitcher with extra people in it.
Champions Online
My grandma said if I couldnāt say something nice, not to say anything at all.
Star Wars: The Old Republic
Done right: Intellectual property. The graphics were phenomenal. It feels like the SW universe.
Done wrong: Character progression on rails on a per-class basis. Strange ābossā episodes every 10 levels, some of which required the equivalent of āclick a single pixelā solutions in story-based point-and-click adventures. Too many bugs (as in insects, not programming mistakes). (āI donāt know, letās just figure out a new kind of giant bug for them to fight.ā)
really? bad character customization in DC universe?
I think its one of the games that allows you to customize your character as much as you want.
Well, here we go:
The Secret World-----------------------------------------------------------------------------------------------------------------
What they do right:
What they do wrong:
The Elder Scrolls Online-------------------------------------------------------------------------------------------------------
What they do right:
What they do wrong:
Guild Wars 1&2-------------------------------------------------------------------------------------------------------------------
What they did right:
What they did wrong:
Tera----------------------------------------------------------------------------------------------------------------------------------
What they did right:
What they did wrong:
WOW---------------------------------------------------------------------------------------------------------------------------------
What they did right:
What they did wrong:
Champions Online---------------------------------------------------------------------------------------------------------------
What they did right:
What they did wrong:
=====================================================================================
What to learn from them all:
I liked the combat in Tera, but nothing else. I am so surprised they are still around.
The hate is strong in this on
I have a strong feeling i should not try that game.
I am unsure what you mean with this?
Oh come on man, THE ELIN FOR TERA? IS THAT YOUR BAD POINT.
Elins are the best! running around as little girl killing people with a 2 meter axe, its only slightly pedophilic
Champions is just really clunky and in no way does anything fluidly.
With WOW you can miss out on an event or storyline and you will never be able to go back to it. They have somewhat tried to rectify this with shards of past dungeons/events but they are very abstract from the game as a whole. Altogether it is just rather immersion breaking and another reason it seems punishing to new players.
Elin in Tera are what make me wary of RP servers. Also, that hilarious advantage they had over any other race because their hitbox was 75% of their actual size, which is already smaller than almost every other race was rather ridiculous, if not humorous.
All in all, fun, but so one-sided.
Then you must have a better copy than I have, because the character options pale beside those of City of Heroes or even Champions Online. For example, it seems to me like thereās very few facial choices of basic faces or facial features. I donāt recall there being much variety in chest emblems or patterns, and what there are seem to owe a lot to Jack Kirby. Perhaps theyāve done a better job of it since I stopped looking, but Iām betting that if I go back in today and start a character Iām going to be disappointed. The power choices are alsoā¦well, lacking. I suppose itās all in the DLCs, and honestly, I donāt like it enough to invest real money.
Huh? I rather like like that kind of events if just the story is written down somewhere telling what happened. Guild wars 2 have the same kind of events by the way.
I suppose it might come down to the fact that I am a bit of a completionist so it sometimes irks me greatly if I miss out on something. Those events do have their place, I am just not a fan of them.
GW2ās living story could be gotten for free the first 2 weeks and then be bought for a few dollars a piece after those 2 weeks were over. i would like something like it in oort, to have events that would make a difference.
i discussed it in āādestrucion of worldsāā or whatever i called it, overkill example but in the end it would be nice to have something like a world where the titans are killing everything around them and if you dont stop them then you have a huge area which is just dead.
but the biggest problem people have with that system is like you, they feel like they miss out. which can also really suck, but i like the incentive to be active and to know you participated in something historic rather than it being repeated every few days >.<
It seems like I may be the only one thinking so, but I always found it more fun to have class-exclusive skills, for example, I like to give a high priority to survivability over damage output (I played something like that in āChampions of Regnumā, āAIONā, āTERAā and āGuild Wars 2ā). If all skills are available to everyone I often feel unindividual, especially at higher levels. Just my opinion though, maybe I have just never played a game which did such a system the right way (I never played āThe Secret Worldā, is it good?).