Disappointing. Sorry, I have to disagree with the masses on this one.

Rating: 4/10 (19 October 2019)

It's pretty clear this film makes a lot of people believe they understand mental health more than they did before watching it. If they DO understand it better, hooray, but I suspect that for many it enhances real understanding little more than Rain Man did for Autism. Rather anecdotally and surface.
So, in my view, another opportunity missed.
But what really disappointed me was Phoenix. He was amazing in Gladiator, and probably did a better illumination of mental health in that.
I was looking at my watch from 40' into Joker, and pretty much every 20' from there. Just didn't do it for me, sorry.