Just saw the film, and I think that there's a fine line between humanity and sympathy and the film treads it very, very carefully. Take someone like Hitler (yeah, going for the Godwin), he's a monster and nobody should ever, ever sympathize with him. But then there's the popular cartoonish caricature of him because people don't want to think of the idea that he's also a human being. And ultimately I think that we learn less from the tragedy that is WWII because of it. The Joker isn't quite there, but I don't think that the director ever intended for the audience to sympathize with Fleck. He's an utterly unenviable but nonetheless very human character. Even the comic books have taken stabs at the idea - the Killing Joke had the flashback (the truth of which is left to the reader) which IMO is actually a sympathetic characterization of the Joker. The film is a similar study and as I see it, a very well executed one. Saying that "he's an incel" is a surface-deep description of a deeper character. It's a depressing and tense film. A 7.5/10 for me maybe, almost a bit too heavy for one sitting.