Cinematic Universes aren't breaking new ground?
And do you remember how bad on average comic book movies used to be?
Cinematic universes weren't anything new. I'm not gonna even go the easy route and cite the Universal Monsters. There have been shared universes in film for a long time. There was a Godzilla shared universe in the 50's. For some reason people decided that doing it with comics franchises was something unique. X-Men started their own universe in 2000 and it exists to this day(albeit with quite the confusing timeline). I could be here all day if I started listing shared universes in TV.
As far as the average quality of films, that's subjective. Plus, what signifies an "Age"? How long are we talking about? Does Nolan's Batman trilogy fall into this current age we're talking about? I can point out good to great comic book movies from every decade. There are a lot of comic book movies coming out nowadays; hence the quantity part of my previous post. The majority of them are just ok or good movies. A small handful are really good and there might be a couple great ones that have come out in the last decade. The Dark Knight turns 10 next summer. I know I'll still remember how great it is ten years from that. I definitely can't say the same for the vast majority of shyt that's coming out now. Christopher Reeve has been dead for over a decade and everyone knows him for a comic book film from nearly 40 years ago. nikkas ain't remembering Ben Affleck or Chris Hemsworth for their comic book movie roles in 2057, breh. With all of the success comic book movies have had as of late they've done nothing to move the genre out of the label of "summer blockbuster/popcorn" films. So no, it's not a Golden Age; the genre is just at its peak of popularity.