Why?
Why film a beautiful - if flawed - book, if you're going to throw out all the best bits while inserting random crap of your own. I could understand if they went full Hollywood and made a story that was more coherent than the book but to throw out most of the original story, replace it with mutant crocodiles and bears and still try to keep it 'arty'? They obviously wanted to have their cake and eat it too and the result is just a mess of a story.