I've never seen a game to generate rage like Dota and League of Legends.
Some people, however, start raging as soon as they launch the game. Maybe those special beings live in a state of perpetual fury, some kind of digital Hulk who is always angry.
Now pick 5 of those players, group them and match them against 5 other raging players... it's hell in digital form, and the only way to escape it is to hope your team will behave slightly less badly than the enemy team.
Still, I can't stop but smile to the idea of a raging feeder being paired with a similar player. Maybe they'l fight to see who will feed first and collect more player insults?
Low priority is truly a nasty place.