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To be honest I find if you view it as a completely different thing to the book it is much better
A very good point, and one which needs to be made, again and again.
True wisdom...
Yes, it is.
However, my problem with this is whenever I come across a movie adaptation of a book I have loved, I find it difficult to disentangle the two.
Instead, I tend to see the flaws, the omissions, the narrative short-cuts, the conflation of different minor characters, the shallow interpretations, the lurid over-statement, and sometimes, worst of all, the ultimate crime against literature, the utter mendacity and heresy of tacking on a happy ending where the original text may have suggested a different outcome, opting instead for the bittersweet integrity of art.....(and life)...
But, yes, you do have a point and a very well made one; it is easier - and probably better - if they are treated as two entirely different things, the sort of different things where the art of narration must be approached entirely differently, too.
Nevertheless, because I'm an avid reader, my preference for the written word (especially if it is a book I love or admire) means that the book almost invariably takes precedence over film. Mind you, there have been cases (rare enough) where the movie far transcended its written source (the first two Godfather movies come to mind - both far better than the book which inspired them), but the converse is more usually the case.