Halo Wars
Halo 3
Halo ODST
Call of Duty 4
COD World at War
COD Modern Warfare 2
Godfather 1 & 2
Fallout 3
Fable 2
Left 4 Dead 1 & 2
Fear 1,2, & Files
Blue Dragon
Brutal Legend
Bayonetta
GTA 4
Saints Row 1&2
Resident Evil 5
Dead Space
Prince of Persia
Mirror's Edge
The Orange Box
Too Human
Soulcalibur 4
Oblivion
Unreal Tournament 3
BioShock
Mass Effect 1 & 2
Overlord
Assassin's Creed 1 & 2
Crackdown
Prey
DEAD RISING
Dead or Alive 4
Street Fighter 4
Star Ocean The Last Hope
Prototype
Eternal Sonata
Tales of Vesperia
Devil May Cry 4
Kameo: Elements of Power

updated the list, and as a bonus here are two of my sleeper favorites
Dynasty Warriors Gundam 1 & 2