When I first saw Chaos Theory, the coop multiplayer drew me in the fastest. But once I started playing the single player campaign, I couldn't put the controller down. This game is so fun and almost scary realistic that every time I play it, I grip my controller so hard that my hands start to sweat. The best improvement by far is the one hit kills (or knockouts). In Pandora Tomorrow, if you were in front of someone and elbowed them, they would stand dazed and dizzy. But in Chaos Theory, one swipe of the knife, the best improvement by far, or one good punch will send a guard crashing to the ground. And don't even get me started with the graphics. Dare I say it, they look like 360 graphics. They are so realistic and lifelike, you have to see it to believe it. If you have an Xbox, and you like action games, it is absolutely imperative that you own this game.