I actually thought this was a pretty fun issue. The art didn't really bother me because it was so expressive and stylistic, kind of like a more cartoony version of some 80's Batman art.
This felt like it mixed together the plots of Harley's B:TAS episodes (Harley antics and teaming-up with Batman) with that Brave and the Bold segment where Batman and Green Arrow first met (wealthy heiress fakes her kidnapping to steal her own trust fund).
It was nice to see them depict Harley and Ivy on a "break" rather than double-down on them being the ultimate ride or die romance like they sometimes do.
Comparing Cassie to a lost love of Bruce on par with frikkin' Andrea Beaumont was a bit much, although I wonder if that was the point because over the course of the issue they completely destroyed Bruce's image of her and their relationship.
Did Two-Face really deserve to get hit like that? Especially since they were implying Batman would've hit him if Harley hadn't. Like, okay, the way he talked about fooling around with Cassie was a little sleazy (I guess Grace really mellowed him out) but he wasn't doing anything to warrant getting hit in the face.
This isn't the first time Batman has slapped the Bat-Cuffs on a beautiful blonde love interest to close a story out but this is probably the first time he didn't feel bad about it.