Left 4 Dead is great because of its simplicty. Theres no power ups and crap like that. Theres not even a long,drawn out story.
You play one of 4 "stereotypes" in a zombie movie. And through cooperation you have to get from point A to point B. If your with 3 people who dont want to work together,your all gonna die.
The music cues pick up just like the movies,the tension is great,and the AI actually changes were alot of things are.
There MAY be more ammo here this game but not the next..Same goes with the enemies.
Single player is fun,but your AI buddies almost make it too easy (you are always one of 4 people weather they are real or AI).
Online with real people and your headset on is a blast.