No Fair. Got here late…How are Super Smash Brothers and Mario Kart not being mentioned? Man, the Gamecube was like the golden system for 4 player mayhem. However, let’s not forget the Burnout Crash Junctions. You could do and endless round robin competitions and have a unique score every time.
As far as more recent games go, I gotta say Little Big Planet is a fantastic party game. 4 players through the campaign is a blast, but those custom community levels are really where the fun is at.