Sure, the comic is amazing. The art is great, the characters well developed and the plot out of this world, but what people don't realize about The Watchmen, is that they revolutionized comic books in a big way.
Watchmen was a break through book in many ways for comics and in comic book history. It represented the era and captured people's fears of us nuking it out with the Russians...something not really done in previous comics. The characters were gritty and real. They had serious issues and were all rather flawed. While I give major credit to Stan Lee for creating some of the first "flawed superheros" Watchmen totally wins when it comes to revolutionary comic books. It changed comics since its production and release. They're the reason all the dark and disturbing, political and outspoken stuff exists today. They broke that ground.
I totally recommend going and reading the novel before seeing the movie. It looks like they got the movie right on, but its always better to know how the story is really supposed to be before giving the movie a chance to fuck it up.
I've written papers for college on this stuff, and yeah I'm a purist geek who takes it too far, but lets face it....this movie is going to kick some serious ass...just like the comic.
Hey its better than doing crack....