I am not a Batman fan especially, but this was pretty good. A surprisingly subdued little story that sets the Joker up as a dark mirror of Batman and philosophizes about the fragile nature of sanity. (My favorite bit: the Joker commenting that the only difference between him and the rest of the world was "one bad day"... and then pointing out that Batman had a bad day once, too, a day that changed everything.)

I enjoyed the implication that superheros are as broken as the villains they hunt, they have just drawn different conclusions from the events that removed them from the rest of the human race.

I've been groping for the words to describe the tone of this story, and just realized it reminded me of Sandman more than anything else. It has the same sort of... sympathetic tone toward everyone, regardless of which side of the battle they're on or what part they play in the story.