Didn't make sense! You'll leave dissapointed and confused.

Rating: 2/10 (7 November 2019)

Yes, this is a Joaquin Phoenix art & character study movie, hence the 2 stars, both deservedly his but everything else didn't work, starting with the title and who he is supposed to turn into. After 30 minutes even his acting became stale. I nodded off for 5 minutes.
Wait for the DVD or stream it but just for Phoenix's acting. The connect between his portrayal and the DC/Batman villain is so thin, the film would have worked better not having the connection. In fact, the connection actually makes the film less credible, the lack of logic associated to mental illness is completely lacking.
Ultimately, bad writing and directing and that connect with DC were why it didn't work. The film should have been called "Bulber" or "Comic"
DeNiro, was wasted and has gone by way of Willis. Needed the money, were you doing Carson? Wrong!!!
Maybe the writer and director should have taken a psych course or a seminar on pyschosis and bulber-affect syndrome before they wrote this drivel or considered the comic book, movie(s), TV series or anything DC or Batman & Joker dynamic we're about, one way or the other could have worked but you can't have your cake & eat it too.