"One of the most integral innovations this console generation has to be co-op gaming. It's right up there with networking and dual stick controls. Co-op gaming makes many games that would otherwise be considered average or good, and makes them better. I mean just imagine if Gears of War, Halo 3, Call of Duty World At War, Halo Wars, and the newly released Resident Evil 5 didn't have co-op. Would they still be as genre defining experiences? These games might still be great, but co-op pushes them to the elite status of their respective genres. With the recent release of Guerrilla Game's Killzone 2, one of the main gripes from the media and gamers alike is the lack of co-op play in the game. Granted, no media outlet marked down Killzone 2 because of the lack of co-op campaign, but they certainly are insinuating that it would have received higher scores. My question is how do we know what games require co-op?? And should co-op gaming be the new standard?"