I don't think it's that simple. Film is many different things to many different people. People will see Joker because they want to see the performance. Some people want to see it because it seems like it may have something to say. Some people just go to eat some popcorn and be entertained by flashing images for two hours.
I'm not a general audience kind of guy. I gravitate towards things that make use of themes, and messages, or try to make a statement on something, or offer a look into a part of the world, or type of person I'm not familiar with, or challenge my preconceptions.
If a film is made to be a commentary on society or any other subject, then you can judge it based on the strength of its commentary, or whether or not it has anything meaningful or valid to say about said subject. But if somebody wasn't looking for stuff like that and they had a different experience and take on a given piece of art, then that's fine too. But I do feel like since film is comprised of so many parts, you should offer more than just a single critique. It can't be all about the commentary, or all about the performance. The script has to come into play as well. The writing is the most important thing.