What Games?

hey guys I just bought a new xbox. I was wondering what are some most have games?

I'll give you a list:
- Modern Warfare 2
- Battlefield: Bad Company 2
- Bioshock 2
- Mass Effect 2
- Assassin's Creed II
- Halo 3
- Gears of War (2)

Here are some games I recently both and love:
Gears of War 2
Modern Warfare 2
Left 4 Dead 2
Battlefield Bad Company 2
Halo 3

1. Borderlands
2. All of the Call of Dutys
3. Gears of War 1 and 2 (1 has better online but 2 has a better campaign)
4.Which ever Halo floats your boat
5.Red Dead Redemption and Alan wake when they come out

RED DEAD REDEMPTION
LEFT 4 DEAD
CRACKDOWN 2
CALL OF DUTY: MODERN WARFARE 2