[The Saucepan Man]

I have seen that 'quote' used a number of times, but never seen any attribution.

I suspect that it is a misquote of something like: "There are parts of Tolkien's tale which we felt would not work well on screen, so we made changes based upon what we felt would work better in the visual medium". That, of course is not a direct quote, but represents the approach which appears to hae been adopted by Jackson, Walsh and Boyens. And I can fully understand why, given the different nature of the two media.

I do not believe that Jackson has ever said anything derogatory of the books, at least publicly, and I would be surprised if he had any negative feelings towards them. As far as I am aware, he has expressed only praise for Tolkien and his works, most notably in his Oscar acceptance speech, when he paid tribute to the man.