In any case, the point about comic books is that characters of wildly different power levels working together or fighting each other works due insane amount of plot armour and other writer provided plot contrivances. So unless one wants to turn D&D into a game with a crazy amount of narrative plot control mechanics, the same won't work for here.
Yep. There’s also a reliance on non magical inner strength that’s not really modeled in D&D. Captain America can be counted on to not wallow in pity when they end up in the dimension where doctor doom won or whatever.
Also the less raw powerful hero’s are often the tacticians which is left to the player in D&D, taking away another avenue to model.
Although both of these strengths are helped a lot by narrative contrivances as well…