If I were to describe this issue in one word, fantastic would be it.
Really, that sums it up nicely.
The concept of the Joker "enlisting" random Gothomites to "help" Batman was fun enough but they took it one step further here when they made the Joker take up Gordon's role. I seriously laughed when I saw that, it's such a twisted reveal that is both seriously dark and humorous at the same time.
The real kicker is the end though, I usually read the Joker as knowing Batman's identity but I don't know if we can take that as a given in this story. Does he know? Is that part of the game? I guess we'll find out next week.