Left4Dead is Valve’s first attempt at a horror genre, and I must say: I am far more impressed than I ever believed I may may have been.
Imagine the weaponry of Counter-Strike, the graphics of an improved and more gothic Half-Life 2, and the feel of a 21st century horror film. That sums up Left4Dead.
L4D blazes the horror genre, not by tactical survival play, but by first person run and gun tactics. While L4D is a run and gun breed, it also brings a multi segmented campaign worthy of single player mayham.