I've become the "grump" at my workplace for disliking Marvel movies. The entire reason is they're formulaic, predictable, cheesy, etc.
The push-back on my grumpiness is usually along the lines of "No they're not, they're awesome!" -- for which I can't really debate: if the person really likes them then it's just a matter of opinion. But often another opinion is to dismiss my critique as a "Who cares? If they [fans] enjoy it, then so what? They enjoy their thing and you enjoy yours?"
But it reinforces your point that these things have just been watered down for the most mass audience possible. There's no "art" in them anymore. And whatever originally made them special has been distilled to a formula so that "they" (the fans, maybe not the original fanbase though) can just enjoy the formula. The popcorn-movie aspect of them.
It isn't just comic movies and Star Wars/Trek, but also things like The Fast and The Furious movie franchise too.
In recent years Martin Scorsese had been vocal against Marvel movies [1], and he's received hate from Marvel fanatics since [2]. But I agree with him.
1. https://www.nytimes.com/2019/11/04/opinion/martin-scorsese-m...
2. https://www.avclub.com/martin-scorsese-versus-marvel-superhe...