If anyone here hasn't read Poetics, I do recommend it. It's easily available on Google, and it's only about 50 pages (different PDFs use different formatting, so page length will vary).
For pargraph 1, the idea of art being subjective actually originates from post-modernism. Modernism, to give a tl;dr, was the critical movement that art is to be criticized at face value to minimize opinions and interpretation for the sake of objectivity (Man, does that sound like someone we know?!). Post-modernism was effectively denouncing these values to show how subjective what people did or didn't consider good art was. All of this was well before modern day blockbusters were a thing.
Not a totally accurate characterization of modernism. It was an artistic movement, not a critical one, and basically it rejected traditional forms and innovated newer, abstract ones.
Ulysses, The Sound and the Fury, and
Guernica are modernist works, so it was very successful. It would take quite a while to list modernist achievements in painting, novels, music, etc.
Your definition of postmodernism is closer, but it's not a question of good or bad art so much as a philosophy that rejects traditional perception of reality. Relativism is key to postmodernism, but that's not a wholesale rejection of merit, only a redefinition of merit by a given context or situation. Postmodernist artists and critics evaluate art as naturally as anyone else. Overall it doesn't make much sense and in terms of art its legacy is much less impressive than modernism.
Postmodernism certainly moved the cultural needle closer to subjectivity, but it's only used as an excuse by the idea of complete subjectivity, which is a grossly simplified version that was created by fandom.* Anyone who sincerely profess that nothing is better than anything else is most likely a fan trying to make themselves feel better about enjoying less than great movies, which shouldn't even be a problem in the first place. Your self-worth shouldn't be tied to what cable sci-fi trash you enjoy and it doesn't matter how many people don't like it! But that's another large issue.
*It does have an antecedent in the Roman saying "de gustibus non est disputandum," meaning "in matters of taste, there can be no disputes," but that's not an intellectual concept, only an adage meant to make people get along.
For paragraph 2, I agree. I would say you don't need to explain dramatic theory to point out why so many Hollywood franchises crashed and burned, but that more so speaks to the fundamentally stupid choices a lot of modern films have been making. Honestly, my only addition would be there's room for an in-between of "casual guy drinking" and "understanding entertainment", but boy does MauLer fail at that (for reasons we've discussed for at minimum that past ~280 pages here).
Agree, and to keep beating the dead horse, the quality of current Hollywood is the only reason Mauler is successful. People are willing to watch hours of pedantry on The Last Jedi/The Force Awakens as therapy or an outlet for their rage.
For Paragraph 3, Poetics is interesting to this day because he's not trying to argue what you should value, he's pointing out there's a reason things are done a certain way. I know this is a simplification (henceforth why I recommend a reading of it), but he wasn't trying to argue how great any one work was; he focused on the resonating and reoccurring choices storytelling kept making and made guidelines around it.
Stuff like this is why I love this thread, by the way.
Yes, agreed that Poetics isn't a statement that some things are more valuable than others. But it is a necessary premise that Aristotle expects you to accept, because without that the book wouldn't make any sense. And yes it's been a great thread.
To offer a common ground I know we both agree on: MauLer doesn't know what he's talking about beyond his own personal values, and uses "objective" to correct people "wrong" opinions, which is cringe.
That's as concise of a summary of Mauler's failings as anything else in this thread. He's a very developed self-righteous ignoramus.