This movie was as true to the book as any movie can be. It appears that no part of the book was deleted. The first half of the book was about how Harry, Hermione and Ron would destroy the Horcruxes and while they learned they had to move about to keep from getting captured. It captured the friendships and future loves of each character. The part where they finally opened the locket was exactly as it should have been, creepy, because Voldamort was trying to get Ron to not destroy the horcrux but it backfired and enraged him to the point where he would indeed destroy it.
Overall the movie was excellent. I really enjoyed the action. It told the basic story line of the book very well. Yes there were parts that were left out, but to tell the whole book's story would have taken 4 hours or more, not possible. It will connect the five previous books and the final book very well. The last two movies are the complete 7th book. They decided that they could not leave out anything from the last book so they are using the movie making model from "Lord of the Rings". It will serve well.