An interesting one this, what is essentially an animated prologue to The Dark Knight (no spoilers in it afaik), there's several short stories, all slightly different styles, all slightly different animation/art styles, but all with a common thread.
The animation is pretty Anime-esque, slightly heightened from Batman: The Animated Series (which stands as one of the best cartoons out there), the stories are written by various writers including David S. Goyer, Josh Olsen and Brian Azzarello.
While it's good, it doesn't quite have the tension or action levels to compete with the movie versions, not that it's trying to 'compete' per se, that was a bad choice of words, but it struggled to keep me totally engaged at times.
Essentially though it's pretty well done and a nice bridge between Begins and TDK.
Batman: Gotham Knight - 7/10