One of the best online shooters to date with an amazing single player campaign.
User Rating: 10 | Call of Duty 4: Modern Warfare X360
What's not to say about Call of Duty 4 that has yet to be said? The game is flawless. Quite literally. The graphics are possibly the best I've ever seen, topping the shooter charts. It's smooth, detailed, and renders extremely fast. The game's single player campaign is great. It really gives you a feel for the game and the story. It gets REALLY hard though once you jack up the difficulty. That being put aside, COD4 has amazing voice actors. They really jack up the intensity of the game by seeming like they are real people fighting a real war with you right beside them. Enough talk about single player. Let's move over to XBOX Live. Superb, addictive, and fun. The online may get a little frustrating because of the fact that people spawn in front or behind you, and pop in the back for an easy kill. But that is all justified when you shoot them in the teeth from all the way across the map with a 50 cal. sniper rifle. C0D4 is a masterpiece. 
