I don't really know what my top ten list of all time is, to be honest, so I'll simply list the games that I thought were above average this year:
Sonic Generations
The Witcher 2
Skyrim
The Metal Gear Solid HD Collection
ICO & Shadow of the Colossus HD Collection
Deus Ex: Human Revolution
Crysis 2
Alice: Madness Returns
Batman: Arkham City
Trine 2
Call of Duty: Modern Warfare 3 (I liked the campaign more than the campaign from Modern Warfare 2, plus the expanded spec ops and whatnot were nice additions, and the guns felt much more visceral than in MW2)
Kirby's Return to Dreamland
Dead Space 2
Killzone 3
LittleBigPlanet 2
I'd put Infamous 2, Gears of War 3, Dark Souls, and White Knight Chronicles 2 there, but I haven't played them yet.
Now, as for games from that list which I would consider putting into a Top Ten list:
Sonic Generations
Batman: Arkham City
Crysis 2
Kirby's Return to Dreamland
The Metal Gear Solid HD Collection
With an honorable mention to Alice: Madness Returns because of just how different it was.