I read the comic. I liked the comic. I certainly don't think it was the greatest comic of all time like most fanatics do. But I'm definitely willing to call it Alan Moore's Magnum Opus.
But My biggest problem with Watchmen has always been the fact that it's totally character driven; every time I read it, I always caught myself just drifting through the thought/speech bubbles just because I wanted to get to the next part that involved Rorschach rather than to immerse myself in the story. I might as well have just read The Question issues by Ditko. If it weren't for a few plot points of interest provided by the Comedian, I probably wouldn't have bothered buying the book.
In which case, the story's conclusion was just so ridiculous. What the Watchmen decide to do in the end makes sense according to their authoritative mentalities, which was Moore's point. But to say that they'd be given the opportunity to make such a decision based on what Ozymandias did is ludicrous. I mean, seriously: It wouldn't work. The world wouldn't just say, "Let's work together to thwart this mutual evil!"
If the movie's totally faithful, that means I'll just being seeing this same story played out on screen with beautiful visuals. I'm not sure if those visuals and the Rorschach segments will be worth ten bucks and 3 hours of my life.
It also makes me feel kind of dirty to go see it while knowing that the creator felt the rights to it were stolen from him. I mean, I'm not sure I agree with him, but it still feels weird to contribute to his misery.