Best game for xbox 360?

I love Final Fantasy XI

offically speaking it is Gears of war but personally i own Gears of war but i play lot n lot of Call of duty 3 which i rent and also rainbow six and madden 07 with cousin on live and then Gears of war. But i totally love call of duty 3

I really enjoy call of duty 2, and halo 2. They are about the best games out there. The only bad thing is that it takes forever to be seen as one of the better players in the game and by then you either get bored of the game or find a new one that's better. I just got good at call of duty and started playing halo. Now when I play call of duty I'm one of the bad players again.

If you mean now, probably Gears of War, if you mean later Halo 3...