The Lord of the Rings
Books versus films can invoke many passions. I think Jackson has done a great job of interpreting the books but don't expect an exact copy. I think the attention to detail here is amazing. Its effects permeate the films and give wonderfully rich quality. What results is a trilogy of good but not great films. For me the best is to be seen in the first film and the worst in the last film. If only he'd do an adaptation of The Hobbit.