a major thing that prevents me from playing mmos is the extreme amount of buttons you have to press, coupled with the ui clutter. this is why i liked runescape so much when i was younger and why i like pso/pso2 a lot as well. they are so much more simple and elegant.
every single time a new mmo comes out it'll pique my interest, but then i look at the gameplay and it's all just a shit ton of who knows what on the screen and that is an instant turn off for me.
@Ace66062 and it's not that i think other MMOs are bad, it's that they just really are not my thing whatsoever because my brain shuts off when there is that much stuff i have to keep track of. i'm much more a fan of pso2's focus on movement, positioning, and timing, rather than having to juggle a lot of different skills.