OK. We all know that if the upcoming movie was origonally a book it will most likely be horrible and be nuthing like the book itself. There are some exceptions (Andromeda strain, Jurassic park, The Right Stuff, and the Dune books) but overall this rule follows throught.
The most infamous example is Starship troopers. That was absolutely nuthing like the book.
Others off the top of my head that had little if no relation to the book they say they take credit from are: The lost world and Sum of all fears
Some will argue that the Lord of the rings movies take off in strange directions from the books, but i have not read them, so cannot comment.
So why do directors say they follow a book when it is obvious they have never read the book beyond the back cover?
We all know whay Verhoven took off from Troopers, but what about the other movies?