The movie lacked lots of key points that set the foundation for the final film. They just glossed over the Horcruxes and that's the whole point of the final book! Instead of adding scenes that did not take place (that ridiculous scene with the fire was just over the top Hollywood) they should have made sure key scenes (i.e. Harry and Dumbledore visiting the Gaunts) were put in. Why burn down the Weasley's house? I guess Bill's wedding will be cut in the final movie. Never mind that's where the chaos unfolds in the final book. How about more attention to detail and less unnecessary special effects? J.K. Rowling provided enough action in the books that could/should be easily carried over into film with a budget as big as I'm sure HPs is.