I have read the books and felt the beginning could have been planned much better -- such as the part where Bella is laying in the woods, grieving Edward's sudden departure. (Her acting just seemed to leave much to be desired, I wanted to see real GRIEF, not mere curling into a ball as though she was simply going to nap.)
Meanwhile . . . that's just my opinion. There was some really cool special computer animation and camera effects, such as how time went by in Bella's room and the werewolf phenomena. By the end of the movie I felt very glad I'd gone to see it.
REGARDING THE BOOKS: I loved book 1 (called "Twilight") more than the first movie. I hated how that first movie presented Edward as a stalking-predator-dominating personality who shows up in a young girl's room uninvited, long before she's expressed any interest in him. The book never did that. I couldn't put down the second book, "New Moon" either. By book three, "Eclipse," I began to feel irritated with Bella and wanted to shout. "Make up your mind already. Decide who you love and stop torturing the other man!"
There's just something terribly cruel about leading a man on, romantically, week-after-week and month-after-month when Bella seriously has romantic intentions for someone else, entirely. By book four, Breaking Dawn," when Bella's pregnant, nothing about Stephenie Meyer's writing makes sense. In nature, wild cats give birth to offspring born with fangs and claws but Bella can't carry a square-toothed "human" baby without having it destroy her entire body. That same book would have us believe that Jake only loved Bella because of the infant she carried, when he was obviously infatuated with Bella long before she ever became pregnant. DUMB-de-dumb-dumb!
All that being stated . . . I still think Stephenie Meyer is an entertaining writer. Her books are worth reading for that purpose -- even when I didn't always agree with the plot or story line.