It hinges almost 100% on the performance of whoever plays Joker. Good thing that Joaquin Phoenix is an excellent actor and he carries the film. Really another less capable actor and this film would have not been nearly as compelling. As it stands it is a good portrait of an unstable character and it is a film that is well made and looks great in addition to Phoenix’s great performance. That being said, not sure why this is a “Joker” movie? Can this character of Arthur Fleck really become THE Joker…I did not believe that.