I don't think I've ever raged at WoW, been pissed for about two minutes on occasions where a ninja has stolen loot. I think with WoW I get more disappointed than angry.
WITH MODERN WARFARE 3? I've just turned that shit off lol, I don't remember any of the other Call of Duty's being as frustrating as MW3. It makes me RAGE.
Mortal Kombat 9 > PURE UNADULTERATED RAGE. Try Shao Kahn, any other boss or tag teams on normal, let alone the hardest difficulty setting.
Gears of War 3 pisses me off. I have pretty bad gamer rage when it comes to fast twitch games lol.
I hate when people say 'I don't get angry at games because I'm an adult'. I've invested £40 on a single item which consumes my time and on occasion adversely provides me with no entertainment. It's these same guys that claim they are adults and don't rage at games that rage after their football or basketball teams lose, regardless of their fat slobbish asses having no input in the match other than saying 'he should've done X/Y/Z play'
EDIT: Don't forget the Dragon Ball Z games!