Saturation is the word.
There are so many from Marvel, DC, Sony etc, most are mediocre crap.
DC has always been complete shite (Omitting TDK)
Sony's efforts have been laughable. Venom was ok, that's as good as they got.
Marvel obviously won the superhero war but the last 5 years they've been pumping out sub-standard movies/tv shows and for the casual superhero fan, you get bored and cant be bothered with it anymore.
I'm a filthy casual, loved Avengers, Spiderman, GOTG...... still haven't seen GOTG3 because by that time i was done with superhero movies.
Deadpool 3 is only going to be watched because of Wolverine, if he wasnt in it no way would i watch it, and i will probably wait for it to come to Disney+, wont even bother going to the cinema.
For me, less is more and the stuff that is released, it should go the way of the Dark Knight and Logan, darker, moodier & more mature. But that's never going to happen.