I have just watched Joker and it was an interesting film to say the least. It is a mix of a superhero film and a film about the mentally ill.
It is set is another universe as different from the universe where Adam West was Batman, or Michael Keaton or Val Kilmer or George Clooney or Christian Bale or Ben Affleck or most recently Robert Pattinson but it could just as easily be set in the real world of the 1980s as, other than the mention of Thomas Wayne and being set in Gotham City this could easily be set in the real world and that is what sets is apart from any of version of the Batman universe, which this ultimately is, and a decent version of it as well.
The film works just as well if you strip away all of the Batman elements and take it as a story in its own right about society and mentally ill people within society.
Joaquin Phoenix was sublime in the lead role of the person who would ultimately become the Joker and there were times when you felt quite sorry for him and his lot in life which shows how good he was in the role.
I enjoyed all the Batman references as a big comic book fan but you really didn’t have to have a knowledge of Batman lore to enjoy this film at all as it was quite separate from any other Gotham set film.
It is easily the most violent Batman film of all as well but that is not a criticism.