I don't think dark and edgy is really the answer. And while I'm sure comic fans would love more space action, I don't think that would work either. People already
thought this one looked too much like a silly CG cartoon.
They probably just need a solid, well-written Earth-based story that grounds the character a bit better and makes people see that he's just as cool and badass as a Thor or Iron
Man (something I don't think the marketing for this movie really got across at all).