There are a lot of discussions where people will decide that James Bond is a superhero, because he's a larger-than-life hero who beats the bad guys by doing larger-than-life things. And I don't think that's a useful definition.
Kurt BusiekI think that the superhero-as-metaphor involves a superhero being some sort of intellectual, emotional, or other such concept writ large. But I don't know that it's a necessary part of the appeal that the superhero be superior.
Kurt BusiekI wanted to be a writer, but the idea of writing novels or movies seemed really intimidating. I never got more than a few pages into one.
Kurt Busiek