What made Batman: Arkham Asylum stand out for you? For different people it's different things. The gameplay, the story, the atmosphere, and so on.
For Thegamereviews.com it was the voice-acting...

Such a broad question obviously has many equally adequate answers, but I argue that one answer stands tall above the others, an element within the game that is so blatant, so obvious that it’s easy to neglect it, to forget it’s even there. That minor detail comprises the voices of Batman, the Joker and Harley Quinn, respectively Kevin Conroy, Mark Hamill, and Arleen Sorkin.

Miss Razz via thegamereviews.com »