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.
Pro Invigorating team-work dynamic
Left 4 Dead 2 requires players on the same team to cooperate in order to survive. This makes for an interesting team dynamic, as it will be increasingly difficult to make it through a level if any one player on the team decides to go off on their own instead of staying with the group and cooperating.
Pro Unique and diverse 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 mode 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.
Con Not much different from its predecessor
While the game has been improved from the original, if you did not have much fun with Left 4 Dead, you will probably not get much enjoyment out of the sequel. It is essentially the same game and some have complained that it just feels like a large DLC update.