What I have heard is that this choice was done not becuase it "looks cool" but because Watchmen is a deconstruction of superhero tropes. The comic itself deconstructs Golden and Silver age style comics; what I heard is that the director chose the 90's superhero movie look of tight leather and overtopness as a deconstruction of the 90's superhero film. Honestly I feel the same way about the slow-mo. Watchmen may be about real human characters in a superhero world and how that would actually work, but it still uses superhero tropes both in its design (hypersaturated colors, ridiculous costumes, the panel format) and in its storytelling (zomg villain! zomg destroy the world plot! Avec une tweest). Again, we are talking a deconstruction, so the slow-mo may be used as that.
Then again the overuse is a little "oh come on this is not 300 it is bloody watchmen"
Even so, I like the costume design choices and I think it works. I would rather have this look than the candy-colored designs of some of the costumes from the comic.
*e* oh chriiist.
But I'm just as worried that they'll remove that altogether in which case whaaaaaaat. oh geez.