"Not a film."
They are films. They are big, massively expensive movies positioned right in the heart of the current American commercial film industry accounting for a great portion of ticket sales. Trying to redefine them or carve out some new terminology on the premise that "they're not films, they're something else" as a response to criticism of them is literally nonsense.
Claiming that responding to them as films is ridiculous, because...they're films.
A lot of them happen to be poorly directed films with terribly childish narratives. The best one can do to honestly defend them is just to say that they deliberately mimic and borrow the narrative techniques of another medium, and of a specific genre in that medium - American commercial superhero comics - that is characterized by childish, clumsy and repetitive narrative.*
As one well-known comic creator of his day described the genre, "We're talking about page after page of fight scenes and bad dialogue."