What are your top 5 favorite Xbox live games?

I want to buy some Xbox 360 games for my new xbox 360 pro and want to know what you think are the best to play online with friendsWhat are your top 5 favorite Xbox live games?
1) Left 4 Dead

2) Left 4 Dead 2

3) Call of Duty World at War

4) Borderlands

5) Call of Duty Modern Warfare 2 (haven't played yet but I will soon.)



O__oWhat are your top 5 favorite Xbox live games?
Left for dead 1 and l4d 2

Gears of war 1

Call of Duty:World at War

Modern warefare 2 (just started playing)

Rockband 1 and 2

ohh and single player Fable2! =]



Edit: I almost forgot about the new single player game I havent played it yet but it looks frikin awesume!

Dragon Age..I might get it!



anywho Hope this helpsWhat are your top 5 favorite Xbox live games?
saints row 2

borderlands

cod:WAW although you might wanna get MW2 I personally prefer WAW

PGR4

Cant think of another I guesss HALo
Resident Evil 5

Left 4 Dead

Gran Theft Auto IV

WWE Smackdown vs Raw 2010

Tiger Woods 2010