So I've had my Xbox 360 for over two years now, and because of that I've had a chance to purchase and play many Xbox games. I have Halo 3, Call of Duty 4, Modern Warfare 2, Left 4 Dead, and many others. There are so many great games out for Xbox, and so far I have to say that my favorite is definitely Call of Duty 4. Released in 2007 and developed by Infinity Ward and Activision, Call of Duty 4 revolutionized the modern first-person shooter. It was one in a kind, you'd never seen anything like it. In addition, CoD4 reengineered competitive online gaming, with its revolutionary online matchmaking system and xp-based leveling.
Now tell me, what's your favorite Xbox game and why?