Place four survivors, millions of zombies, and guns in one game and you pretty much got one hell of a game
Gameplay:
The gameplay is amazing, each campaign basicly takes place in a horror movie facing against millions of zombies. There are many types of zombies: common, hunters,witches,boomers, smokers, and tanks. Each with it's own tactics and features. Play this game with friends and you'll never get bored
AI:
The AI is where this game shines, it's almost like every character is reading your mind when they say something. And the AI director mixes up the way zombies are placed around the level providing much replay value
It's worth the money but be sure you know people who have it, playing with yourself or people you don't know isn't as fun as playing with friends