Best Game Concept:

Batman:
    Arkham Asylum

Batman: Arkham Asylum places a large emphasis on the lasting and historic impressions that an insane asylum can have on a person and the atmosphere. With constant thrills around every door, no one knows what Arkham Asylum has in store for the Batman let alone the players. Using an insane asylum at the roots of The Joker is a noteworthy accomplishment to get correct the first time.

Runner’s Up:

Assassin's Creed II