1) Several of these movies have earned over a billion dollars at the box office. The customers like them. Tarantino is part of “the industry” — so what I see here is “the industry” criticizing the customers for obsessing with products that aren’t good. That seems a little like elected politicians criticizing voters as “deplorables”.
2) Also, customers may buy tickets, but the customers don’t make the movies. Tarantino’s peers in the industry are making these things. Tarantino seems to be criticizing a few movies, but what he ought to emphasizing is that his industry is soulless and obsessed with profit and doesn’t mind turning out crap. Don’t say “the movies are bad”. Say “Hollywood is bad”.
The reason Hollywood makes superhero movies is that, due to the enormous investment required to produce a movie, producers are highly risk-averse. They don’t like to gamble on new concepts.
Superheroes are considered to be “presold” properties. They have a built-in customer base and bring in a lot of moola.