Summary: Unfortunately for me I did not play Arkham Asylum before picking up this gem of a game. Not being the biggest Batman fan I thought it would at least pass the time. While, for the most part, the graphics are stunning I have to say that the best part of the game are the absurd amount of extra sidequests and background stories. As you progress you unlock more and more background for each character, location and even the city itself.
Summary: I love this game! I love both of the Arkham's. I like this one more than Arkham Asylum because it Is a longer and more challenging game, has better combat moves, and has different side games to (in my opinion). To me the graphics aren't that different then Arkham Asylum. Both are beast games.
Summary: Brother likes this game and even I enjoy seeing batman kick butt. It's a detailed game and really keeps the details of the Batman storyline in focus (he has a fighting style, the voice acting's good, he's still the greatest detective, and the Joker is still insane) There's an interesting feature where you can choose different batman costumes, nice to see the different iterations through the years and a few new ones as far as I can tell.
Summary: This game is amazing. The story is interesting and will have you wanting to know what happens next the whole time. The graphics are stunning (thins like animations,city,etc). The gameplay is also really fun.