My biggest problem with most of current superhero movies is that they're way too cliche-y and as
@Monkey D Theories said, have no soul.
I still enjoyed GotG vol 3 very much, and I also really liked Miles Morales Spider-Man movies (can't wait for the last installment in the trilogy!), so it's less of a problem of a superhero fatigue, it's rather dull plots and uninteresting characters.