Want to know why it flopped? For one, a damn musical? People who are into Joker, Batman, etc. They don't go to the movies to endure several hours of musical theater. They want action, and something true to the franchise. Where the hell in the comics did they all just burst into song? And one of the biggest reasons I can't stand it, besides all the 50 shades of gay musical crap, is that Margot Robbie wasn't Harley Quinn.