Here are the ones I have: {including console exclusives}
Ace Combat 6
Battlestations Pacific (wouldn't necessarily recommend this}
Fable II
Gears of War 1 & 2 {they are certainly the best exclusives on the system}
Infinite Undiscovery {don't get it}
Halo Wars
Lost Odyssey
Mass Effect 1 & 2
{I do have Halo 3, but I didn't buy it}