Okay, now that I have finally seen Dr. Manhattan and the rest of The Watchmen in motion, I'm gonna chime in.
Rorschach, Dr. Manhattan, and Comedian are perfect. Wouldn't change a thing. 10/10, respectively.
For the most part, I am perfectly satisfied with Nite Owl. However, I really wish that the cowl was modelled more closely after the design in the graphic novel (round goggles, exposed nose, horizontal head/"horns", and head dress). I would like the cape to come together at the front, but I understand if that would've been too restricting. As for the rest of the suit, I'm actually very happy with it. The story takes place in an alternate reality, so it's not much of a stretch that this seemingly techy suit could exist in the 80's. It's corny, overly designed, and it's very satirical of superhero costumes in modern day movies (whether that's intentional or not). Overall, 9/10.
Honestly, I wish Silk Spectre's outfit was a carbon copy of the graphic novel design, simply because it's so simple in nature, and easily adaptable. A skimpy, black underlayer. A yellow, silk overlayer. Sexy, simple, and faithful. Still, the suit they gave us keeps the basic look, and it's certainly a nice alternative. Overall, 9/10.
Much like Silk Spectre, for Ozymandias I would've preferred the look of the graphic novel. Royal, purple and golden cloaks. I do however, appreciate the direction Snyder went with (the ancient, Greek armor with sculpted musculature and nipples). Still, the colors are a bit too dark for me, given how vibrant I've always pictured the character. Not a bad design, but it could've been brightened up and stuck with the purple/gold palette. Overall, 8/10.
So, combining the characters together, we have an overall costume design rank of 56/60. That's an A- right there. Perfectly acceptable.