Have you heard of:
Enemy Territory: Quake Wars
Hellgate: London (Diablo creators)

Both look AMAZING! Check 'em out, they are both coming out this fall. Don't forget to peep their trailers, very very very impressive. Hellgate has potention to actual take a shit on Diablo it looks that good. Quake Wars IMO if marketed well enough, *could* be the next WOW, but prob not since WOW has 6 million users, thats f*ckin ridic, and I don't think theres 60 levels . To be honest I dont even know if you can level up in Quake Wars, I know in Enemy Territory: Wolfenstien you can and there are different classes and what not, so lets hope they expand on it.

XboxLive: x2xExZ

D2jsp: Your_Mom