[the Platinum Poppy]

If they wanted to capture the comic on film they should avoid using special effects for fighting scenes and the like, EXCEPT of course for Dr Manhattan who's superpowered for real. But any time anybody else performs a stunt, fighting or climbing around on rooftops or whatever, it should be a real (obviously very fit and all that, but still) person doing it for real.
It's so important in the comic that this is a world where real people dress up and act like superheroes, people who seriously don't have any superpowers. Unlike, say, Batman, who in a sense lacks superpowers, but who usually comes across as being SO fit and having SUCH a strong psyche that it's almost like these are his powers, and enough to make him a match for real supercreatures.

Unfortunately I think they'll do it more like a regular action movie with all of the heroes performing pretty impossible deeds all the time.