Let me start by saying that the movie is good.
Having said that, I am reminded of a piece of popular wisdom; knowing too much about the future might ruin it for you.
I have not read the books, so I do not know all the little info that people that have read it know about. However, I knew enough so that the plot was very predictable. I find that New Moon is based on surprise. I knew too much – from either trailers or my sister – and suspected a good deal more with enough certainty, so when they happened I was not surprised. The movie became a simple “Ah, this is how they did it” in a purely technical or artistic fashion.

There were some real gems though. Dakota Fanning‘s performance, although so small, really surprised me. The confidence of a powerful vampire oozing out of the first scenes, the cruelty and sadism of her power as she unleashes it on Edward, and the utter surprise and sense of failure when confounded by Bella. I honestly feel excited at the prospect of her future films.
Also the werewolves were much much better than I ever thought possible from the trailers. A big bravo to the guys at special effects. Jacob facing off Victoria in that one stand still scene was really iconic.

On a side note, when I went to see the movie, there were some fans of the saga that were taking a poll. One of the questions was something along the lines of: “Do you think that The Twilight with its mainly romantic theme is inappropriate given that the Vampire theme is mainly a horror genre?”. The answers were a simple yes or no, however I disagree with the question. People seem to forget that the original Vampire story was that of Dracula, which at its core is a love story.

P.S. Love the irony that the head of the Vampires is played by Michael Sheen who played the head of the Lycans in the Underworld movies.