I do understand that you cannot fit every little detail from the Books into the movies but they really did leave out some big details in this movie.
What happened to the fight at the end, Charlie get's bitten by Greyback and people die, that seems important to me???
Also harry was not standing helplessly under the stairs, he was stunned under the invisibility cloak unable to help. Surely he would have tried to help if he could, not just stand there and watch it happen like a fool.
What about the burning burrow, it's been a while since I read the book but did that even happen???
Anyway, enough rambling, it was a good movie as movies go but not a very good representation of the book.