Yes, but I need to see the Joker do Joker things. There are plenty of movies with good stories. The film is titled "The Joker" after all.
It needs to be a combination of both.
Edit: I'm basically saying that somewhere around the half-time mark, he needs to be doing Joker things. Or, a mix of his "regular" personality doing a lot of Joker things mixed in throughout after a breaking point. It can't just be a person's story, and at the end, he is just revealed to go full-Joker. It wouldn't be fulfilling.