Which highlights another major problem - the way they handle violence in the movie. I mean, I know most action/violent movies aren't going for some sort of anti-violence message, but most are able to sort of handle it in a way that shows the repercussions it has on the protagonist, or show the negative effects in some form.
This was almost pro-violence to a disturbing extent; the slow-mo kills shots and all that were obvious parts, but even the more subtle aspects highlighted it. Harley Quinn and the Joker were almost supposed to be this quirky couple when it's quite obviously an abusive relationship in which he's damaged her. The squad of villains, many of whom are brutally evil, are suddenly likable just cause they begin to get on with each other. I mean...what? I don't have a problem with a movie focusing on villains, but at least try not to pretend that them all teaming up together somehow makes them better people.