Left 4 Dead splitting into two game modes has been one of the most controversial changes amongst the community since the game was announced. Fans were scared to hear the term "death match" used in a game that, for many, represents a cooperative oasis in a desert of *******s playing Counter Strike, Unreal Tournament, and Halo. After that scary word was used, we learned that the proper phrase is "versus mode," which still sounded out of place. We were scared. And yet, after getting to spend some quality time with the two different game modes, we've learned that "versus" can belong in "coop" games. L4D's versus mode sets a group of four people head to head with another group of four to see who can cooperate the best.
This mode, in our opinion, is what's going to keep people playing Left 4 Dead for years.