Need For Speed
Assassin's Creed
Brothers in Arms
Hero of Sparta
Doom
Real Racing
Wolfenstein 3D
Terminator Salvation
Galaxy on Fire
Zombieville USA
The Sims 3
I'd have to personally narrow it down to Assassin's Creed for providing free-roaming, awesome graphics, responsive/smooth controls. Brothers in Arms and Doom are runner ups....
Racing:
Need for Speed Undercover is awesome! Real Racing is runner up