Disliking a film because it borrows elements from previous works, even heavily, is pretty cringe. There is no way you can be consistent with that opinion, like, if you dislike Joker for copying elements from a previous creator....you can't like something like Star Wars, you just can't.

I would also say that as reviewer, if you gave Joker a negative review because its too much like Taxi Driver...you are 100% gatekeeping and have failed in your career. Most people haven't seen Taxi Driver, but they might watch it if they watched the Joker and liked it. I started watching Scorsese films as a preamble to Joker and I'm sure others did as well. Not to mention Joker is still a different film from Taxi Driver...like a lot.