People really think PCs are as powerful as The Avengers? My analysis? Some are, many are not. My thougts:
Avengers that do thing no PC can achieve
Iron Man: supersonic flight, armor nearly invulnerable to any conventional weapon, able to lift 70-100 tons. Genius level IQ.
Thor: actual god, effectively infinite strength, invulnerable to conventional weapons, flight, control of lightning and weather.
Hulk: invulnerable to damage, infinite strength, hulk smash, genius level IQ.
Ant-Man: shrinks to subatomic size or goes giant sized big enough to lift several tons
Captain Marvel: Warp speed, able to single-handedly destroy capital ships in a moment, etc.
Spider-Man: not quite as powerful but still lifts several tons, spidey-sense makes him effectively faster than laser beams.
Depends on what version
Scarlet Witch: either a really powerful magic user or can warp reality and completely change the universe depending on depiction.
Captain America
Plausible as D&D PCs
Hawkeye
Black Panther
Black Widow
Dr Strange: I give him a pass even though he opens multiple portals, etc he's just a really high level wizard. Most of the time.
I'll agree with PCs being superheroes when I see a build that is effectively invulnerable to all mundane weapons and can pick up an elephant or 10 in each hand.