What are some gud xbox live games?

i just got xbox live gold and want to get some good live games.

any suggestions?

oh and btw i've already got rainbow 6 vegas and halo 3.

i like TPS and FPSWhat are some gud xbox live games?
Call Of Duty: WaW, Call of Duty 4: Modern Warfare, Tom Clancy's Rainbow Six Vegas 2, FIFA 09, Fable 2, Halo Wars, Project Gotham Racing 4, Mirror's Edge, Team Fortress 2 (AWESOME!), Fable II, GTA IV and Saints Row Two.

Sorry they're not all shooters, but please play Team Fortress Two - PLEASE!
A good one which is often overlooked is Unreal Tournament 3. I rented it for a week or so, i'm planning on buying it 'cos it's that awesome *points at an awesome object* I played the demo of Left 4 Dead. It only contained 2 levels but I played each level about 30 times! It's pretty amazing mostly because (imo) all of the small parts in the game fitted together so perfectly to create the ultimate package! So really it's up to you but I'd suggest L4D or UT3. ;)What are some gud xbox live games?
Ace Combat 6 Vegas 2 and GoW2
Try Left 4 Dead, COD4, Gears of War(1 or 2).What are some gud xbox live games?
COD4 is a must-have if you like FPS
cod 4, gears of war 2, and don't get cod 5
Left4Dead... If you haven't tried it, it's a must.. And I cosign that Call Of Duty 4 is a must have.