Marvel’s Luke Cage has superhuman strength and bulletproof, unbreakable skin, and that’s way too overpowered to be a “street-level” hero. What makes characters like Spider-Man and Daredevil “fun” is the fact that they are vigilantes who can be hurt; they can be shot or stabbed, and their friends worry about them because they aren’t indestructible. But when you have a character that’s indestructible, then all that danger goes away. Also normal thugs aren’t a threat to you.
You know, sometimes when the Avengers announce a new inductee I’m like, ‘Really?! You think that’s a good strategic addition?? This feels more like a popularity contest!’
Their choices kind of look to me more like a publisher’s idea of what will sell books & toys than a cooperative of gifted public servants. But I’m probably just being silly.