1. Call of Duty: Modern Warfare 2: This highly acclaimed first-person shooter from Infinity Ward is the sequel to the award-winning Call of Duty 4: Modern Warfare. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Modern Warfare 2 is a must-have for any Xbox 360 gamer.
2. Halo 3: The conclusion to the iconic Halo trilogy, Halo 3 is an epic first-person shooter exclusive to Xbox 360. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Halo 3 is a must-have for any Xbox 360 gamer.
3. Gears of War 2: This third-person shooter from Epic Games is the sequel to the award-winning Gears of War. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Gears of War 2 is a must-have for any Xbox 360 gamer.
4. Grand Theft Auto IV: This open-world action-adventure from Rockstar Games is the fourth installment in the Grand Theft Auto series. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Grand Theft Auto IV is a must-have for any Xbox 360 gamer.
5. Left 4 Dead 2: This zombie-themed first-person shooter from Valve is the sequel to the award-winning Left 4 Dead. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Left 4 Dead 2 is a must-have for any Xbox 360 gamer.
6. Fable II: This action role-playing game from Lionhead Studios is the sequel to the award-winning Fable. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Fable II is a must-have for any Xbox 360 gamer.
7. Rock Band 2: This music rhythm game from Harmonix is the sequel to the award-winning Rock Band. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Rock Band 2 is a must-have for any Xbox 360 gamer.
8. Bioshock: This first-person shooter from 2K Games is set in the underwater city of Rapture. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Bioshock is a must-have for any Xbox 360 gamer.
9. Forza Motorsport 3: This racing simulator from Turn 10 Studios is the third installment in the Forza Motorsport series. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Forza Motorsport 3 is a must-have for any Xbox 360 gamer.
10. Mass Effect 2: This action role-playing game from BioWare is the sequel to the award-winning Mass Effect. With an intense single-player campaign, intense online multiplayer action, and a co-op mode, Mass Effect 2 is a must-have for any Xbox 360 gamer.