Loosely based on the graphic novel by Grant Morrison (Arkham Asylum: A Serious House On A Serious Earth), Batman: Arkham Asylum pits the Dark Knight against a whole host of super-villains when The Joker takes over the asylum and puts the entire place on lock-down with Batman still inside. The chaos that follows is purely some of the best Batman stuff you're likely to see in a videogame. The game map itself (the Asylum) is massive - about seven or eight separate buildings and 3 or four outdoor areas to explore as well. The whole game looks dark, gritty and well and truly, Batman-ish. The guys who developed this are geniuses - because I doubt anyone else could've made it look and feel this good. There's also a host of side-stuff to be getting on with, too - the Riddler sets you the task of finding trophies and solving riddles throughout the main game and the Challenge mode is also very cool (you can now download free DLC to play as the Joker in this mode).
The voice acting and cast in this game is second to none - most of the voice actors from Batman: The Animated Series returned to voice their respective characters, featuring Kevin Conroy as Batman and the legendary Mark Hamill returns to voice the Joker. All in all, this game is a must-own whether you're a hardcore batman fan or whether you just dabble occasionally. It's a really great action/adventure game. Easily 10 out of 10 and definitely worth the money you'll pay for it!