I mean, I enjoyed the first time.

Rating: 7/10 (9 January 2020)

And I think nearly everyone who watched in cinema did. It look like a masterpiece.
The second time you see it... well.
The cinematography is still there, great as the first time. And Joaquin Phoenix is still terrific. But the script... The. Script. And the characters aside Arthur...
I think the whole problem was (and still resides) on the hype before the movie, with the release of those trailers, who promised a dark, grounded-in-reality, very diferent tone for an origin story about the Joker (also the 8-minute ovation in the Venice Festival thing). The movie finally came out, and people saw a dark, grounded origin story like no other DC or Marvel film, just what the trailers promised. The rest is history; "It's a masterpiece".
The truth is, that there is nothing more. We get what the trailers promised, a darker tone movie compared with the rest of superheroe-genre movies, but there is nothing that movie wants to talk about, no seriously at least: What does the movie says? At the end, Joker rises while the city of Gotham burns. Yeah, you could say that its thesis is "Mental illness afects everyone if we, as a society ignores it.". But since the people responsable of creating Joker are two dimensional characters who are hardly real, that message falls apart (along with other problems).
There are a lot of other things that don't quite work, but people alredy talked about it at some point. What I'm trying to say is that Joker is far from the masterpiece people praised it was the moment they leave the cinema. I was one of them, too. There's good in this movie, of course. But a movie is beyond the first impresion.
I give it a 7/10. A flawed movie, who gave me (and most of us) a really nice moment at the cinema who I will never forget.