Valve does it again.
The graphics (and physics) are probably the best part of the game in my opinion, not including the versus LOL. There is a hint of horror (zomg if there wasn't I'd be scratching my head heh) but anyway, you don't know where the zombies will turn up next because of the way Valve made the game. They made it so that everytime you play it will be a different game. One game zombies may be flooding a subway station, the next, they may be elsewhere waiting for you to walk into their trap. It's just another way to keep u coming back for more.
The versus is probably the BEST part of the game, multiplayer game of the year IMO. You can either be the survivors and play the game like you would the campaign(which i'll explain later) OR, you can play as the elite zombies and coordinate your attacks and try and kill the humans. If you dont have XBL(or rather a connecton to it) GET IT NOW. You wont have nearly much fun with the CPU then with buddies online. Just hearing your friend scream to get the zombies off him makes it all that much more fun.
Now for the campaign, which is good not as great as versus but theres two modes:
1) online campaign - self explanatory really, just u get to experience the campaign with 3 other buddies online.
2) offline campaign - again pretty self explanatory, it's just a local game on your console.
The one thing about the campaign that is cool, same with the other modes is that you play the game like a movie of sorts. You have to keep moving through the game otherwise the "Director" will send the kitchen sink that you literally full of zombies. The one thing I don't care about the campaign is that theres only 4 levels which can be done in a couple hours each so pretty quick.
Overall Review - 9.5
graphics - 10/10
campaign - 7/10
gameplay - 10/10
controls - 9/10
multiplayer - 10/10