I know it's awful, but as a long-time Roger Corman fan I can't help admiring it. Everyone overacting like crazy, the way they don't even care how silly the special effects look, the eeeeevil villains... This is a classic drive-in B movie made 30 years too late. "Can Johnny and Susan go to outer space with us?"
But whatever its faults, at least they didn't cast Jessica Alba.