Harry Potter and the Deathly Hallows: Part 1

They divided the book in two to make two movies. More screen time to tell the story... and more box office. Nevertheless the effect was good for the storyline. Most of the important parts are there and the changes are minimum. Looks like they ran out of polyjuice potion, understandably, no one wanted to see other people playing the main characters most of the time. And the tiny score is...7/10