This is different because she was mainly a villian. This is like having Harley Quinn show up in every justice league movie.She was the "wolverine" of the brotherhood. That X-factor (pun intended) character that would give a group wins none of the other group members could, cause said character is hard to see coming and weirdly impossible to kill. Problem is, writers get a hold of that kinda character and have em all in the videos dancin. (Batman is arguably the justice league's equivalent to an extent but that's another conversation...)