While the Marvel Cinematic Universe is still wildly popular among comic book movie fans, it's clear that the franchise has taken a dip in general audience approval in the past few years. Many movie-goers are citing superhero fatigue as a primary reason for this -- claiming the studio is only producing "more of the same" with each new outing. With projects like The Boys, Gen V and Invincible tackling superhero storytelling with a more visceral approach, there is a definite shift in the superhero spectrum that audiences seem to be responding positively to.
Source:https://www.cbr.com/mcu-xstatix-superhero-fatigue/