Why Margot Robbie as Harley Quinn in 'Suicide Squad' would be important for DC movies

Margot Robbie is currently rumored to be taking the part of Harley Quinn in David Ayer's 'Suicide Squad,' a comic-based movie in which DC villains are pressed into government service to pay for their crimes, and we think it could be a major decision for the studio, especially if they're really planning to use the Joker in the film as well.