Wow's absurdly easy to level in.
That said, if your friends are ditching their lives and losing jobs over a video game, it's not the fault of the game for being "too addictive", it's a problem they have. (and a serious one, if it's affecting their lives that much).

I play WoW a lot (more than I ought), and still manage to have RL friends, a girlfriend, a job and occasionally do some exercise.
( Mockingbird Practitioner of SCIENCE, Fri 22 May 2009, 11:49, Reply)