True.
Left 4 Dead can be batshit scary.
I love the zombies in it.
They stumble around like the traditional ones, but once they see you, they are like rockets.
The levels are very creative and consistent and each of the four stories is like a little movie you pop in late at night.
The 2nd one is okay, but loses a lot of the fear factor in favor of Army of Darkness style humor, which is what it intended so you cannot hold that against it.