Is Anything A Greater Cinematic Achievement Than The MCU?

Do I think a future Christopher Frayling is going to be writing volumes on the intricacies of the MCU characterization?
Very unlikely. It just does not have the depth of the spaghetti western genre.

As Variety said about the latest Star Wars movie:

'Though the series has always been self-aware enough to crack jokes, it now gives in to the same winking self-parody that is poisoning other franchises of late, from the Marvel movies to “Pirates of the Caribbean.” But it begs the question: If movies can’t take themselves seriously, why should audiences?'

If critics of the age are seeing the films as non serious, imagine what a future historian will think. Probably write them off as banker-Wall Street designed movies with more money put into marketing than the productions themselves.