Seriously though, this is a good position to take. I prefer to think that any team with individuals like Superman and Wonder Woman on it, due to their *nature*, if not their 'power level', is never going to say to someone, 'You're not good enough for the League. Stick to the minors.' Clark and Diana, in particular, are *nice* people, and seem very likely to honor and respect heroes with less (or no) powers, who fight the good fight, like Batman, Green Arrow, Black Canary, Hawkwoman, etc.
About the only people I'd say don't fit are those that don't fit tonally, like Captain Carrot and the Zoo Crew, the Inferior Five or Ambush Bug.
There are a few characters that *should* have bigger responsibilities, like Dr. Fate or Green Lanterns, but the universe seems to run itself just fine with them hanging out on earth, doing a whole heck of a lot of 'not much' for their actual jobs, so, whatev.