All I'm going to say without seeing the movie is that if you just see the movie and don't read the book or don't plan on reading the book, SHAME ON YOU!
I've never read a single comic book in my life and I picked up Watchmen
last month because I heard it was that good
. It is. bring on the movie.
Also, I'm flexible on the ending. I've only recently gotten into it so the material isn't really sacred to me. I just hope they do what makes dramatic sense. The ending on the page works well for the funnybooks but I'm not sure how it would translate to the silver screeen.