GameSpy writes: "Perhaps more than any year that's come before it, 2008 could be called The Year of Living Cooperatively. This holiday season has seen the release of many excellent co-op games on every gaming platform, from Gears of War 2 to Call of Duty: World at War to Resistance 2. While all of those games are great examples of where co-op gaming could be headed in the future, for the last few months our eyes have been focused squarely on Valve's Left 4 Dead. Instead of just shoehorning a second player into a traditional single-player campaign, Left 4 Dead has been specifically built for co-op play from the ground up, and the resulting product is one of the most intense, enjoyable gaming experiences to date. It gets better with every human player that's added, to the point that playing with three of your friends is close to gaming nirvana".