As I answered in a similar poll, I don't really get how she'd make the Avengers look weaker atau worse. How exactly would she make them look weak? Unless they're implying that a non-enhanced woman being able to keep up with the superheroes makes them look weak - my answer to that would be a) she's been trained and in the comics I believe she was enhanced as well, though the films omitted that, and b) it makes her look strong, not the others weak.
