This was very different but in a good way. The art was phenomenal and set a spooky crazy atmosphere. 
 Overall the story (Batman going into the Madhouse to save the police officers held in custody and in general to win Arkham Asylum back) was really good and I appreciated the added layer of Batman questioning his sanity and the Joker always using his unsureness. 
 Several characters whom I didn't know (such as the Mad Hatter) made an appearance which I didn't mind at all. It was nice to catch a glimpse of them. I really liked the twist in Scarface's story. It made me happy beyond words. Terrific ending! 
 The only thing I didn't appreciate where the letters on Joker's text because they were hard to read and made the reading experience somewhat annoying.