At the core of this film, it is a love letter to the DC Universe. This film doesn't focus on just one era of DC, it isn't overly focused on the SnyderVerse or the BurtonVerse, but is its own thing, and has its own story. Setting aside real world controversies, Ezra Miller is fantastic in this film. He is by NO means better than Grant Gustin's portrayal of Barry Allen, but Ezra does something new here...twice! Keaton's Batman and Calle's Supergirl are also not used as gimmicks. This movie is exactly what it says it is. It is a Flash movie with Batman and Supergirl used as icing on the cake in a wonderful way! Director Andy Muschietti delivers some very creative and imaginative action scenes, and really elevates what can be done with superhero action sequences.