It really depends on the movie and book, but I do think some movies do their books justice. For example, Hunger Games. The movies are perfect and captures everything that was in my mind as I read the book, plus more. Watching the movies that are based off of books I have read and enjoy is like bringing a fantasy to life
Like most people I don't like to read a book and then compare it to a movie. When comparing the books Hannibal and the film Hannibal, it shows you how much a film has to let go in order to make a film a suitable length and that they will change the story line, if it suits the filmmaker. I believe some films do a story justice and others don't, it really just depends on the filmmaker and the details in the book.
There are a lot of movies that have been based on books and those movies do nothing for the story being told. Books have a lot of information in them, and are very detailed. When a story is made into a movie, it can't include all the information or the movie would be very long.
No, I do not think that movies do justice to a story at all when the story was written in a book to start out. I think that the movie gets a lot of the story wrong, and that it ruins the whole reason the book was even wrote to start.
Movies based on books do not do justice to the story because so much content must be stripped to make a movie short enough to be produced and be profitable. Movies tend to do at least a somewhat good representation of a storyline, but frequently many facts are removed or even distorted.