Novels vs. Movies

I have always been one to enjoy novels more than I enjoy movies because of the detail and other important aspects that may be left out. I understand that the main goal of a movie is to entertain people and sometimes it is difficult to leave certain details in a movie because it would lengthen it too far, but sometimes you can't leave certain things out. An example that I am going to use is "The Road" by Cormick McCarthy, shortly before seeing the movie I decided to read the book and I loved it. I thought the movie did a great job in capturing the essence of the book, but they left out certain scenes that were probably too disturbing to see in a  theater, and that is something I can understand.