I don't understand how people could knock this game. It was fantastic, well-written, goofy fun. Far better than the pretentious GTA 4 in that I didn't have to hang out with friends and watch 5 minute cut scenes to advance.
Additionally, the ONLINE COOP was outstanding, with every minigame adding a cooperative element to make it play differently than it did in single player. This was made by Volition (Freespace, Red Faction:Guerilla) who has a track record for great game production that gets overlooked.