While “Watchmen” was a powerful movie, it was most certainly not as significant to its medium (film) as the “Watchmen” comic was to its own.
But I’ll argue that there’s just no way for a groundbreaking book to be made into a groundbreaking movie. Take The Lord of The Rings, for example. The films are powerful adaptations of one of the most important works of 20th century literature, but they themselves are not among the most important works of film. (Well… they were groundbreaking, in that nothing that large had been attempted before, but I digress…)
But that doesn’t mean I was at all disappointed by “Watchmen” on the big screen. It was amazing. (But it probably will not be my #1 movie of the year.)