The acting was better than expected. The actors, especially Rob Pattinson, really did a good job with their facial expressions. They seem to have taken a lot from the book and incorporated it into their portrayal of the characters.
The story did a good job of fitting everything in while staying on-point, though the plot moved quite fast. Nothing of major importance was greatly altered.
One critique would have to be the editing. I feel like some scenes were cut wrong. The cinematography was decent, not the best, but considering the budget and the scale of the film, it worked.
People who have not read the books can follow the movie without needing to read it, and people who have read the books aren;t left disappointed.