I'll agree to that extent. But it is easier to sell the general public on Bumble Bee being a Camero and not a VW Bug or Megatron being an alien fighter rather than a gun/tank/cannon. So I'm sure that an audience would be just as pleased with an image of Guy Gardner ripping through a spaceship hull with his GL ring than Superman stalking his illegitimate son and dodging paying child support. Give them big time superhero action with some recognizable concepts (GL ring, speedster, hot chick in tight clothing) and it should work.
Yeah, I said before that the Flashes and GLs might very well be the least known versions of the characters, and the general audience wouldn't tell the difference... It's not like most people can tell Barry from Wally or even Hal from Guy.