1. Saints Row: The Third
This game speaks for itself.
2. Portal 2
Clever, funny, and how about that ending?
3. Dead Space 2
Many intelligent improvements with a great story make an awesome game.
4. Dragon Age II
An amazing game despite its many issues.
Fire + Lightning + Arcane
Combine shit to blow shit up.
6. Assassin's Creed: Revelations
Great game, interesting addition to the story but no major differences.
7. Gears of War 3
Great final entry for series and wraps things up in an appropriate way.
8. The Elder Scrolls V: Skyrim
Largely middling experience with several great moments.
Cool story, fun combat.
10. Marvel vs. Capcom 3: Fate of Two Worlds
Great fighting, cool characters, not really any single player value but amazing for multiplayer.