Did a long stint in Wow, getting several characters to high heights. Done with that game, will likely never return.
WAR tried for a short while, couldn't hold interest to long. Vanguard had some ideas, but it's a PvE game, and I'm a PvP kinda guy. Everquest 2 I'm kinda messing around with, but it is only to stave off boredom. Fallen Earth had the idea, but fell on execution, as so many games do. All MMO's have more rooms to improve then a normal game does, but now that the developer has shut down it's fate is sealed.
The idea of a shooter mmo always gets me, but not seen anyone pull it off yet.