The Harry Potter Series
The 8 movies, based on the 7 books. I used to rate it as a 3/5, but have bumped it down to a 2/5. Because I think some of the movies are far from great. It starts very weak, but ends in a strong place. I do however think the movies match the books, in that the reader kind of "grows up with the books", in the same way the watcher can grow up with the movies.