I'm going to have to nominate Critical Miss, if it counts, simply for their awful review of Halo: Reach. Now I know this sounds like a petty fanboy screaming at somebody for not having the same opinions as him (a la Half-Life's fanbase) but it raised a whole bunch of inaccurate criticisms and only a couple of good ones (for example I will agree with what they said about Legendary difficulty. Fuck you, Bungie). On top of that, the very limitations of being a comic meant it could not flesh out or explain its criticisms properly, and left the guys looking like they were just trying to be cool by disliking a mainstream game.
As an aside, I'm going to complain about something else. Whenever a mainstream game gets good reviews from a critic, cue a whole truckload of people going "lol biased reviewers". Whenever someone releases a good review of, say, a Valve game? BAM, they're awesome reviewers who are correct in every way and obviously speaking with their own opinion. It pisses me off, it seems like this whole site is collectively trying to be a REBEL because it's COOL.