Before I forget I'd like to talk about some issues that were brought up here and elsewhere concerning the series premise now that I've gotten a look at the actual show.
Ratman_TF brought it up here though I've heard it mentioned elsewhere
Watchmen was one of those stories that's told without much room for adding stuff without turning it into a farce.
I can understand that viewpoint; somethings are classics and "complete" as they stand. There's nothing much added to the Mona Lisa repainting her except as a cat-girl (Unless you're really into cat-girls).
The series takes with, IMO, wise path or not really adding or changing the original story. It uses the same setting, about 30 years later, extrapolating an alternate history based on the divergent one began in the original story. While there are ties in in the narrative (Some Easter eggs and call back like the visual composition after Red Knight beats information out a subject than points back to the scene after
Rorschach killed Big Figure, Looking Glass' surreal mask particularly the scene where he has it partially rolled up to eat and how the cos refer to their mask as their 'face')
There's hints of more direct tie ins like the police using the Owl flyer (or something very much like it), 7th Calvary terrorists based using a version of Rorschach's journal writings as part of their spiel and crude versions of his mask, the bizarre storms that are thought to be either more alien incursions or a hoax pulled off by the government. There may even be a tie between the main character and another, older man that hints at having the unusual longevity and vigor The Comedian seemed to have. It didn't strike me as over done or farcical. Obviously tolerance is going to vary and if you're opinion is that Watchman was better left alone then obviously its not going to work for you. My feelings tend to vary from work to works.
Related to that viewpoint is the idea that the Watchmen story is best left with the ambivalent ending it has. Whatever happens next is up to the viewer. Again, I can see that outlook. That does appear to be authorial intent. But I've always been intrigued by the idea of the world after the graphic novel/comics. I guess I'm just part of the target audience, but everyone isn't.