"Who watches the Watchmen?"
From a simple question, writer Alan Moore was able to write the most celebrated graphic novel of all time. And after numerous hitches (like the Watchmen Fox lawsuit) and years of delay, the movie version of that graphic novel is now on the silver screen.
The years of waiting was very much worth it: Zack Snyder's version of Watchmen is an absolute must-watch, a great adaptation of a great work. From the visual effects, to the production value, to the story, Watchmen is an instant classic.
Watchmen the film is not different from the graphic novel-- it's dark, textured, and complex. Snyder was very loyal to the material and he was able to get the spirit of Watchmen in two and a half hours. Had it been longer, it could have ruined the film.
You can search the web for resources on Watchmen because I think some appreciation of the source material will enhance the movie-watching experience. I think the film will make fans happy, but make some clueless folks scratching their heads ("What's their powers?," "Who's the bad guy?, "Who's the stronger character?")
But nonetheless, Watchmen is one of the better superhero films in recent memory. If every comic book superhero movie were like Watchmen, the world will be a better place.