I think we're sort of aggressively agreeing with each other. It's not the CGI (or lack thereof) that makes the modern superhero films bad (except as a sort of demoscene-with-infinite-budget visual spectacle where they're great). It's the writing. To a lesser extent the cinematography is poor, which makes it hard to really feel what's going on. There's lots of unnecessary camera movement, frenetic jump cuts during fights, and all the colors are dull and muted.

Every Frame a Painting has a good video on Kurosawa's use of movement in his films, and actually uses The Avengers as a contrasting example and how the cinematography & direction makes the scene in question feel meaningless.[1]

So I agree that it's not the CGI that's the problem. It's the writing, the direction, the cinematography, the editing, the music[2] (though they improved since the linked video came out, directly in response to it), etc. The films are bad in many ways, but the CGI isn't really one of them.

[1] https://www.youtube.com/watch?v=doaQC-S8de8

[2] https://www.youtube.com/watch?v=7vfqkvwW2fs