No one said anything about a superstar. The thread is about superheroes (there's a difference).
You get the term "super" when u start doing things people cant fathom. Superhero, Superstar that's what they have in common. One does it in the name of justice, one on an athletic field.
You don't necessarily need super powers. But it makes it a hell of a lot easier.
It's why Dick Tracey or Mattlock weren't considered superheros. They were amazing but one can at lest wrap their minds around how they accomplished things.
Mattlock was always amazing at how he was able to set a jury to turn the odds in his favor before the true court trial ever began...