4 player co-op? Check
4 vs. 4 balanced multiplayer? Check.
Simple and straight forward gameplay? Check.
Huge gaggles of the living dead? Double check!
Valve seems to have a habit of making great games with balanced multiplayer and it really shows in Left 4 Dead. For anybody living under a rock for the last 10 years, Valve has helped to shape the FPS genre into what it is today with classics like Counter-Strike, Half-Life 1 and 2, Team Fortress, and Portal. They are also known for putting a lot of high quality work into their games and continue to update them for better performance and gameplay. Their latest release, Left 4 Dead, proves that multiplayer co-op is not dead but that many developers have been doing it wrong. It�s simple, easy to pick up, difficult to master, and a hell of a lot of fun.
*Note, in L4D they use the term �infected� in place of zombie. I just like the word zombie more.