MMOs take not much skill to play, I'd just go with online FPS' with MMO elements, like Warrock or other ones.
I personally play Combat Arms.
MMOs are alright, they just usually are very low quality, and require a lot of time to actually achieve higher levels. IMO I have other important games to play, instead of MMOs.
I can only say the P2P MMOs are good, however they can be Free to Play if you go to Private Servers.