Well said, Cryfion. As I remarked a time or three before you ever joined here, there is a very big difference between the two approaches in adapting books to movies.
THE GOOD WAY is illustrated by Emma Thompson's movie version of Sense and Sensibility. Jane Austen had actually been a bit negligent in the book when introducing the character of Edward Ferrars; that is, she simply _told_ us that Edward was a nice guy, without portraying _examples_ of his goodness, Emma Thompson shot scenes that _showed_ Edward practicing kindness and courtesy to people, so we could _see_ why Elinor would fall for him. This did not at all violate Miss Austen's intent.
THE BAD WAY is illustrated by the shabby action climax of Peter Jackson's first Hobbit film. There simply was no _reason_ why Thorin should be made into a helpless punching bag for Azog. If Thorin had fought a good fight but lost by bad luck, that wouldn't have been so bad; but Jackson chose to make him as powerless against Azog as an ant against a boot-heel. This was an _insult_ to a memorable Tolkien character, and there was no _need_ for it. ABSOLUTELY NO PURPOSE was served by this humiliation of Thorin, because it would have been _easy_ to show him needing help _without_ making him a totally wimpy dweeb.
It remains to be seen whether Mark Gordon will respect Lewis' material, or insult it with pretended improvements which are ANYTHING BUT improvements.