Some Dude
Hero
A system that is capable of allowing heroes of differing power levels to work as a team without the high powered heroes completely overshadowing the lower powered heroes. Marvel Heroic Roleplaying for example.
If Aunt May can operate alongside the Avengers, Spider-Man becomes largely irrelevant.I'm thinking of the Endgame movie where the spaceship is raining down missiles on everyone and they are all hiding and such, then Ms Marvel comes to just fly through the ship and take everything out. Begs the question of why she couldn't just fly through Thanos to end the whole problem. It was a letdown to me. The game needs to have a way to let cosmic universe supers play at the table with local neighborhood supers. There is a big gap between the two. Like someone showing up at the D&D table with a 20th level PC when the rest of you are 3rd level.
Traditionally, even games that can model a wide range of power/ability levels (think Champions or DC Heroes) have adventures that recommend a power level in actual play. So, yes, these characters can all exist in the same sandbox. But that doesn't necessarily mean they're intended to fight side by side.
There's nothing wrong with newer or more narrative games that use metacurrencies or some other balancing factor to allow low-powered characters a fighting chance. But there's also nothing wrong with a superhero game or campaign picking a lane and staying in it.