My own top 10.
1. Pokemon White Version, was able to keep spoilers and any information on the game away for 2 years! Whole new unseen world for me, truly a experience for me, and started a pattern for me for the next game.
2. Halo Reach, my favorite and last Halo game I will own, the campaign was awesome the multiplayer solid and most fun I've had with my brothers and friends in a shooter.
3. Mario Party 8, tons of great games that leave us to tired to kill each other.
4. Super Smash Bros Brawl, my brother, my friends, cousins, and the proud nerds at school, all have invested hours in to beating the hell out of everyone of each other and loving it!
5. Halo Wars, best RTS game I was able to find this generation, there were probably better but left me waiting on the sequel.
6. Mario Kart DS, Mario Kart at home, on the car, on the bus, at the doctor, at school, in class, in detention... Good times.
7. Mario Galaxy, Mario in outer space, favorite Mario platformer so far, love the looks, love the gameplay.
8. Mortal Kombat 09, spelled with a K because illiteracy is kool. And so is ripping people in half.
9. Skyward Sword, not my favorite Zelda game but a damn good one loved it and almost every moment of it.
10. Just Dance, I looked like a complete moron throwing my arms around, all part of the fun.