The critics are wrong here. The Batman needs to be dark and moody!
TNS: "The Substance is a body horror film that risks turning away an audience for some of the best bloodiest scenes in recent memory."
In case this needs to be stated explicitly, this contains huge spoilers for Joker: Folie à Deux and the film's ending.
Oh no, Joker: Folie à Deux! Look at how they massacred my boy.