Well i don't know what game to rent for my Xbox 360 i just got. I Already have/rented:

Halo 3
Halo 3 ODST
Left 4 Dead 2
Modern Warfare 2
Bioshock 2
Forza Motorsport 3

I want to rent a good shooter thats fun and has great online multiplayer
But i don't have any idea what to rent can someone what can be
a good game?