Ezra Miller was always there wrong actor for Barry or any mainstream Flash like Wally or Bart. He was cast for prestige points with certain groups in Hollywood. However, the bigger issue was that the movie wasn’t even a Flash story- it was based on a crossover Flashpoint that wasn’t even that popular. If you are going to do a Flash story, do one about the Flash battling the Rogues which allows for people to see why the Flash was popular in comics. Don’t just do a multiverse story to lure people in with cameos.