I didn't think the film was very good.
Yes, it was incredibly accurate to the events of the original comic. But I think that just highlights the real challenge of adapting a work to film, a challenge this film did not meet. Yeah, all of the events were there, more or less, but the tone and the presentation were completely wrong. The songs on the soundtrack were goofy, distracting, and out of place. The overly-stylized look, over use of slow motion, and cartoonishly over the top violence took me out of it. Certain lines of dialogue were read with completely different meaning than what they were in the book. The presentation of certain scenes and characters in terms of the use of color and lighting were way too on the nose (everything about Adrian's coloring in the film says "just so you know, guys, this is the villain"). The things they did change, namely the transplanting of the "nothing ever ends line," showed a lack of understanding of what they meant and their importance to the original story. It seemed like Snyder practically memorized the events of the story, but he didn't have a very deep or meaningful understanding of what they actually meant.
Some people say it was a near perfect adaptation because it got the events of Watchmen on screen without much change. I say it was a piss poor adaptation because it didn't feel like Watchmen at all. It was goofy, overly stylized, and didn't seem to understand the themes and tone of what it was adapting.