As far as sticking to the book goes, this book was pretty spot on. The plan to split it into 2 parts was well implemented and I could not see them fitting in the rest of the book into that small time frame. I loved the grittiness and darkness of this movie. It is a huge departure from the children's story of Harry Potter and the Sorcerer's Stone. Along with the book this movie has taken a very dark turn. Sure there may not be as much action as most of the previous installments, but stat tuned for Part 2!