(it's tough to read, but one person wrote "who watches the watchmen?" and some wiseacre drew an arrow pointing to the quote and wrote "nerds")i loved the novel and the movie is a pretty faithful interpretation, but it definitely has its low points. i hate ham-handed symbolism (i.e. "argh! the comedian was right! life IS just a joke!") and the movie had more than its share of that. plus, malin akerman and matthew goode certainly aren't going to win any oscars for their roles, but i don't think they're as bad as some people say.
despite my generally positive impressions, i left the theater with the feeling that i would have been confused had i not read the book. but mostly because people in the theater kept talking/laughing/making noise and i couldn't hear. we went to a matinee at a mildly crappy theater and the crowd wasn't exactly respectful.
the movie's high ratio of male-to-female nudity provoked quite a bit of snickering amongst the audience. i can understand a brief chuckle at seeing dr. manhattan in all his luminous blue glory for the first time, or at nite owl's relative flabbiness for a superhero... but it's pathetic when adults are still giggling at a completely nonsexual image of a naked person after seeing it for the sixth or seventh time.
i think my worst "inappropriate laughing at a theater" experience was "the fellowship of the ring." i'm a big LoTR fan (shocking, right?) and i had been following the production of that movie for like three years.
i saw it on opening night in a packed theater and i was spellbound, up until the scene where boromir gets shot by a bunch of arrows. a group of people somewhere in the back of the theater started laughing uproariously and i have no idea why... looking at it objectively, there isn't anything funny about the scene; no goofy facial expressions or weird groans or anything.
i was livid at them ruining that scene for me. to this day, i still have nagging memories of those boorish assholes whenever i watch it.