Since last holiday season's Left 4 Dead release, gamers have been vanquishing homicidal zombies with bloodthirsty glee. But as fun as the game is, no one can deny the lack of content there seemed to be. With only four campaigns and a versus mode that utilized the same locale, you could only play for so long before it felt tired. To combat this zombie exhaustion, Valve released the Survival Pack which aimed to increase the longevity of the experience. It wasn't worth the wait.