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.