As a sequel, I think it made the best possible use of the first movie to make something new and ambitious with this second movie.
I really enjoyed it, and I really appreciated a big budget movie that was willing to take risks and make storytelling decisions that might not be crowd pleasers.
Spoilers below:
I have read many of the criticisms of this film and so far nobody seems to have noticed that this film is more about Arthur finally recognising himself as a real person and the Joker being a made up coping mechanism for dealing with his terrible and tragic life.
By recognising himself as a man called Arthur, he alienates all of the crowds of people in Gotham who support Joker, as well as his love interest Harley as well as any meaningful support from prison guards who tolerated him as a scary “celebrity” prisoner. By revealing himself to be Arthur, all of these “tourists” suddenly lose interest in him, reject him and become hostile towards him. That is the great tragedy of this second film. His status completely relies on him maintaining the Joker persona. He can’t keep it up because it’s not really him. He’s Arthur.
It is a tragic love story, but I found it relatable and I felt some empathy for him, a man who tried so hard to fit in, please everyone, failed, violently lashed out at the world, was imprisoned, punished, humiliated and after all of that torment and hardship you see someone human at the end. Someone who wants very little, just to be loved. But the person who he loves does not love him, she loves a false persona that he created to deal with his pain and anger. Once she sees the real him, she swiftly rejects that person.
Although not a major plot point, it was actually a rare moment in story telling where his lawyer is the only person left in his life who genuinely cares for him and is genuinely concerned for his wellbeing.