I enjoyed the fact that the movie followed closely with the book- it was a good set up for the world that Edward and Bella find themselves living in. There were a few moments that would be lost on you if you hadn't read the book, but it didn't necessarily deter from the movie.
The actors stayed in character well and were believeable, especially Billy and Charlie- you believed there was a long, strong established relationship there. The humour was well timed as well.