I have to admit that I am really annoyed seeing Joker in this story. He is the big bad of the Bat-verse and we have a new Batman. So instead of featuring the character in that story, instead of having him step out of the shadows to deal with a new man under the cowl and how his obsession deals with it, we instead have him here. Jealous about Harley.
I'm with another commentor who said that whatever one feels about R.I.P. and Joker's portrayl in it, they should at least follow-up on that before starting to have the character appear in a lesser title in a way that is in no way reflective of his last major appearance.