Love it. I love this game. Feels like CS, Half-Life, and a zombie movie. And it really is a zombie movie. Each Campaign is in a different setting, complete with a movie poster and film credits at the end which show you your stats. Your allies are actually competent, and don't make many mistakes. Now, the Campaigns are pretty short; I rushed through the first 2 in about an hour each. But the difficulty levels and replayability are what make this game great. I've only played it on normal, and I've died quite a few times. There really isn't a defense against the horde of the undead; only cooperation will prevail. The cooperative gameplay is one of the major selling points, and when you start playing, it really hits you; you just can't survive on your own. Trust me; I've tried. I went crazy and killed my bots to see how tough it would be. Word of warning; don't kill them. It even allows you to play as the Infected, and although I have yet to try this out, I'm sure it's pretty sweet. So far, I have no complaints, and although I just got it today, I'm sure that none will arise. So if you're in the mood for a great zombie FPS, then L4D is the game for you.

Now, if you'll excuse me, I have some zombies to kill.