I used to play WoW. I only stopped because I lost interest. I may actually re-open my account at some point later this year. I know a bunch of people who play WoW who aren't fat. I know a bunch of Suicide Girls (including the cute one you can usually see in the Indieclick banner) that play WoW. WoW is just a fucking game, people. The MMORPG genre may have its fair share of problems, addiction included, but at the core it is still just another game.
Making fun of people who play WoW is kind of like picking a soft target, anyway. You know that there is already negative sentiment there, so you're more likely to be able to say "LOL, AMIRITE?!" and get a few people agreeing than you are to say, criticise Halo or FEAR, even though it's pretty much the exact same thing. In every bracket of anything anywhere there's always gonna be a bunch of morons that do their darndest to fuck it up for everyone else, whether it be by being lazy, easily-addicted idiots or by being antagonistic, vindictive assholes.