It looks so awesome it isn't even funny. When I get my PS3(mark my words Mom&Dad, you will buy me it one day...) I won't be sure to buy LittleBigPlanet or Arkham Asylum, they both look so awesome!
Coming from a random developer, Batman was the biggest surprise in probably all video game history. Because comic book video games are notoriously bad, and this developer was unknown. But it did great. It stayed away from the new movies and didn't try and tie in(some people think that Batman is bringing the Joker in from the end of The Dark Knight, he isn't. At all.) and it had great gameplay mechanics spanning from sneaking to detective to combat. Plus it was definitely made by people who really did love the Batman universe because the entire game was filled with easter eggs, they knew what they were doing.