I bought this comic and read it as a friend recommendation, because I'm a fan of Batman, but not to the extent of buying any of his comics. But as my friend said that "this must be the comic used as inspiration for Batman: The Dark Knight movie for how the Joker is depicted" (and that is my favourite Batman movie by far), I couldn't resist reading it...
And yes, this must have been the inspiration. Not only the Joker is visually almost the same as the movie one (with the smile-scar in the face), but for his true madman psychology. Here the joker is pure chaos, pure dementia. He is bad, he has clever plans and ideas at some points, but above all he is really crazy.
We have a dark and decayed Gotham, with some classic enemies ruling part of the city's underground activities and no clue of how is Batman going (but not as successful as he would like, that's for sure). The drawings and specially the painting give the comic a creepy look, and both language and images are not for children. Kills, tortures and sexual related acts appear.
Also, the title is very appropiate: Here Batman is a secondary character. The narrator isn't the Joker ether, but it's better to read the comic ;)
Much better than the original, "more appropiate" joker, this one really scares. If you enjoyed the latest movie, or just like Batman, go grab the comic!