My worst fear came true as HP7 Part 1 starting showing so many deviations from the book. There were deviatios in HP6 too. For example, when the trio escapes from the wedding, they land at Tottenham Court Road and not in some theater district. Dobby does not bring Mundungus back with Kreacher, only Kreacher does.
Also, there was a lot of scope for some good action and spell throwing but the movie was just like a travelogue.
My advice, if you have read the book, stay away from the movie.