To be honest, I've gone completely off MMO's, and I've played a ton of them.
Started MOBA's (DOTA2 specifically) and found it to be awesome fun! League of Legends & Heroes of Newerth are also contenders, though, Dota2 is the better of the 3 as it apparently has Icefrog working for Valve (large Dota contributor I think).
It does have a large learning curve, and I'm always learning things, but once you have played 5-6 games and get your first kill, you get the kick.