Enjoyable romp, but it runs so long it becomes exhausting. James Gunn hits many of the same beats he did with Guardians of the Galaxy, to the point where much of the script could have worked with those characters, and he goes wild with gore and destruction. That said, Margot Robbie is a goddamned delight, and it’s easy to understand why Harley Quinn has become the breakout character of the DC universe.