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Left 4 Dead 2 is a co-op first person shooter from Valve. In the game, 4 Survivors try to make it through multiple campaigns with different game modes by using a variety of weapons.
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Pros
Pro Unique forced cooperation
Left 4 Dead 2 requires players on the same team to cooperate to survive. This makes for an interesting dynamic for teammates, as it will be increasingly difficult to make it through a level is any one player on the team decides to go off on their own instead of staying with the group and cooperating.
Pro Unique co-op versus mode
Left 4 Dead 2 features a versus mode that pits two teams against one another. For the survivor team, it is basically the same game as the normal campaign. However, versus adds a new way for teammates on the opposing team to work together by playing as the infected, which opens up a whole new play style and set of strategies.