5. She's The Reason We Won't See Harley Quinn In Arrow
Arrow fans have a lot of reasons to hate the Suicide Squad movie. The simple fact that it exists means that Task Force X has now been made unavailable to The CW series, but that pales in comparison to what Margot Robbie being cast as Harley Quinn means for Arrow. After making a cameo appearance in season two (her face was never seen), viewers were left unsure just how much of a role Harley might end up playing in the future. The series has after all come under fire for borrowing too many characters from Batman's world. However, Arrow star Willa Holland recently revealed that producers had "big plans" for Harley before word came from Warner Bros. to scrap them. Hopefully Robbie's take on Harley will be great enough to take the minds of Arrow fans off what they've missed out on!