I happened to see Angelina Jolie's Unbroken before I read the Laura Hillenbrand book about the life of the amazing Louis Zamperini. My guest for an early screening was someone who had read and loved the book - and was dying to see the film.
I came away from the film amazed by Zamperini's story but unimpressed by Jolie's film of it. My friend, however, was outraged. Having read the book, he said, "This should have been the greatest movie ever made."