Generally movies that are made from books dont do the story justice. I've liked the movies but they are horrible compared to the books. There just isnt time to put all the details from the books into a 3 hour movie.
What I hate is movies like The Sum of All Fears. If you saw the movie but havent read the book my advice is READ THE BOOK! I dont know how Tom Clancy could have authorized the production of that piece of tripe! Most of the other Clancy movies were good, especially The Hunt for Red October, even though the were changed dramatically from the written version.
I'll put the soap box away.