It's more than I'm annoyed with the MCU being confused with "good cinema". It's disposable entertainment, at best. To be honest, nothing in the MCU has downright "offended" me like, say, TF Revenge of the Fallen. It's actually pretty harmless, by comparison. But the problem is that these movies are being treated like the "be all, end all" of the cinema experience. I feel like diehard MCU fans think the franchise is untouchable, and in a way it sort of is. It's untouchable in that it plays things completely safe, adhering to a specific grab-bag of elements that are carefully formulated in such a way that feels was designed in a test-audience laboratory. But not acknowledging this system is problematic in the grand scheme of the film industry, because nowadays people simultaneously demand more from their movies, but also default back to "safe territory" with the films the MCU puts out.
The MCU has become somewhat impervious to criticism; that is downright fucked up, to me.
That the best MCU film is also sort of boring in some spots (Civil War) is telling; there's so much potential to make some truly interesting, complex films...but they just don't know how to ride that line without falling back to what's safe and familiar.
I'm just not emotionally invested in these things. Not in the way I was with films like Spider-man 2 or Batman Begins.
The sheer scale of the MCU and the constant need to sell me on one character after another just so I'll sign up for their solo film is...fucking exhausting.
Things were a lot simpler pre-MCU. Even DC had the sense to give their coveted franchise to a real filmmaker and let him, y'know, make some real fucking movies with it.