I re-read the book prior to seeing the movie and I'm very disappointed. There are so many things left out that are important. The potions book of the Half Blood Prince's was one of the main focus' in the book but I think barely touched on in the movie. I know they can only fit so much in during a 2-1/2 hour movie, maybe this one should have been longer than that or possibly two parts as well. I explained things from the book that were left out of the movie to my family so they would have a better understanding of why and what it all meant. Better luck on the Deathly Hollows, hope I'm not disappointed in that one as well.