Actually loved it.
I understand why it was disliked - it's a musical, and it wasn't Joker terrorizing the city.
It was So beautiful, the score was really Perfect for this movie. The casting was perfect, the details of psychology were so well written. The movie pacing was perfect and I WAS NEVER BORED. It was dramatically intense.
I'd love to see the next movie take a turn of terror haha, but this was mentally grinding and disturbing. Also very court-roomy- which again I can see why this was unliked by watchers. I also liked that.
People didn't like it because it was not what they wanted it to be.