Based on the definition of a superhero, yes, they would qualify. They've got the powers, the moral code, and the neat gadgets. But personally, I think it would be more accurate to call them space wizards. The force is essentially magic that all jedi/sith can tap into with proper training. The more they train, the more powerful each spell becomes and/or the more spells they learn. Which makes it different than superheroes whose powers are constants, not continually evolving (in most cases).