I really enjoyed the 1st Issue! Harley was as adorable as ever, and Ivy and Catwoman had a nice dynamic. Bonecrusher was a lame villain, but hey he was meant to be, and even provided a bit of comedy.
[Spoilers!] The Riddler was also a nice addition, quite funny, and the reference to the Mad Hatter was a bonus for me as well. Two of my favorite Bat-villains in one issue, quite cool! [End Spoilers!]