Almost perfect!
The graphics are awesome, the story is very engaging, and it's just a lot of fun to play. Unlike many super hero games on the market today, Batman Arkham Asylum isn't just a fighting game. You get to use all of Batman's cool gizmos too! Like the Bat Boomerang, the Bat Claw, and a few other neat little toys.
I would have given this game a 10 except for one thing. Like it's console brethren, it has save points (check points). So if you die, you may have to do a good portion of the game all over again. That's one of the great things about true PC games - you can save anywhere. I wish Batman had that feature.