I don't know about you, but I have always been a fan of the Film Noir. A lone detective tries to solve a crime with no leads. He eventually finds some clue or someone who knows more. He tries to tell those around him, but most are skeptical at best. Like all film noirs go, there is always more than seems to be present.
Having not read the graphic novel Watchmen, my opinion of the movie may be biased, but guess what I'm the one who's writing. Not you. So what I say goes. Watchmen is a great film. It is truly a unique look at "superheroes" if they could actually exist in an alternate version of the world. None of the characters have superpowers, save for one and like almost all superheroes, his powers only belong to him due to an accident.
The characters of Watchmen really make this film what it is. Each character sees the world from one perspective. Pure black and white, a place where superheroes can't make a difference anymore, or a world on the brink of total annihilation. It is only after their beliefs are shaken to their very core do the Watchmen begin to make the hard choices.
Watchmen is a visually stunning film. It has graphic violence and nudity galore (male and female). It's an important insight into the superhero genre that will be appreciated by fans of that lore. All others will just have to sit back and take Watchmen for what it is, a modern, carefully woven, excellent, film noir.