I can't ragequit multiplayer games. No matter what, I just can't let myself, it is some weird compulsion, I just think: "Man, all these people set time out of their day to play a game, I'd be a jackass if I dropped now."
On single player games I ragequit pretty much constantly, I have little to no patience. Mass Effect makes me rage quit to the point that I've never completed the first one, the reason I rage quit is elevators. If I end up having to travel through about 3 elevators without anything cool happening I can't play the game for at least a week, it makes me WAAAAY too angry.
I rage quit on any of the Civilization series a bit too. If I have >99.99% chance of winning a fight, and if losing have a 60% chance of retreating instead of dying, but I still lose the unit, especially if this is the second time in a row this has happened, I'll rage quit to the point that I can't sit at the computer for an hour or so. I don't know how many times I've had a highly experienced tank (or the equivalent thereof) die to a freshly made archer/axeman/etc. Civ5 uses different ways of showing you your chances in a fight, but on the harder difficulties those too pretty much constantly lie, on Immortal 3 out of 5 "Decisive Victory" battles are most likely going to result in death. I understand there is always a chance of failure, which I like, but it is pretty much statistically impossible to get that <0.01 chance roll twice if not thrice in a row. Civilization, making the impossible possible.
I love both of those games, though they are also the games that make me the most angry.