You see, to make a very long story short, the end of “Dawn” has Bella, Edward, and their vampire family facing off against evil vampires. At one point, it looks like a fight begins and Edward’s foster father, one of his foster brothers, and the leader of the evil vampires, among others, bite the dust (no pun intended) in the attack. Then it turns out that this was all a vision, a hypothetical situation, if you will. One of the good vampires, who can see the future, has shown the vision to the leader of the evil vampires to show him what the cost of the two sides fighting would be. This helps convince the head evil vampire (Michael Sheen, who by all accounts goes gloriously crazy as bad vampire Aro in this movie) to call off the battle.
Of course, while this scene was not actually a change to the plotline (it’s referenced in the books that Aro is made to see the vision, though the reader only hears about it afterwards), some fans still didn’t like it.
My take? Good for them for changing SOMETHING (even if, comparing it to the text, it’s an incredibly small change).
I know that adapting a book into a film is an incredibly delicate balance, even more so when the book has a devoted fanbase attached. But the director and the creative team behind him or her needs to feel free to create the best product, the best movie, that they can without it being obvious that they tied themselves to every word on the page of that book.