I've seen Joker twice now and I really like it. It's a fantastic performance from Phoenix and a great movie. Not Taxi Driver-level great but way up there. One thing that's cool about the movie is that even if Batman and Joker had never existed, this movie could still have been made exactly as it is. All the rest of what I love about the movie I can't really discuss because it'd spoil too much, but I can say it's a movie that stays with you. Also, for the record, I still very much prefer Heath Ledger's Joker and The Dark Knight overall, but that was to be expected.