I hate people who ragequit in online games so I try to never do it myself, I almost always at least finish the current round, unless my team is grossly outnumbered or someone on the other team is glitching or something like that. But the games which bring me closest to ragequitting are MW2 of course, Left 4 Dead, and, sadly, sometimes even TF2. In TF2 I especially hate it when I'm playing against a couple of really good players and I'm getting stomped not because I'm doing badly myself but because the rest of my team is pants-on-head retarded. I know that's what I get for joining random games, but really, some of these people are so stupid, and it's even worse when they're not using their mic too so I can't even try to help them improve.