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In other words, Cal (rereading and seeing possible unclarity), the closer a director’s input *approaches *zero, the less I, personally, am likely to be interested in seeing the movie. YMMV.
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I’m going to jump into this side conversation because, well, it’s my thread. 
I’m of the opinion that there are many ways a director can put his or her stamp on a film, and that input is vital to making a good movie and a good book adaptation (the two are not always the same). My objection, and I think the objection of those sparring with you (they’re welcome to jump in and disagree with me), is when the plot, setting and characters are drastically altered to make a movie shorter or more palatable. A couple of examples, from books that I love:
Matilda - Was there any good reason to move the setting from England to America? Was it just so that they could shoehorn Jersey-ass Danny DeVito into the movie? The essential Welshness/Englishness of Roald Dahl’s books is a significant part of their charm, to me at least. Why mess with it?
Vision Quest - Several adult characters from the book are squished into one, Mr. Tanneran, in the movie. Since this wasn’t really an “action book” (or movie), but one about a character growing and learning and relating to others, this was very jarring to me.
I love when a director does a great job of faithfully adapting a book to film. It’s an art, and a difficult one. Some of the sets in the LotR trilogy came close to making me tear up, because they actually were as full and beautiful as I’d imagined for 20 years. To go back to the LotR example, Peter Jackson and Fran Walsh did a great job (with a few exceptions) of condensing Tolkien’s wordy dialogue into something that conveyed the idea and the feeling of the original, yet was succinct enough to work onscreen. I love that.
What I can’t stand is the arrogance or just plain ignorance of someone who slaps a happy ending onto The Hunchback of Notre Dame (and writes a sequel?!?! WTF), hands the characters in Dune some weird sound guns, or turns the title character from The Running Man from a desperate, borderline asthmatic working family man into…well…oh, don’t make me say it.