Film and books are two different media - you can't make a direct comparison. I suppose you could say, as someone said about radio over television drama, that in books the scenery's better.
Jonathan Miller objects to film and stage adaptations of novels, on the grounds that it was originally written as a novel for a reason. I think that's going too far, but I think that film adaptations should be regarded as supplemental to, not alternative to, the original book. If, for example, you watched the BBC adaptation of 'War and Peace', but haven't read the book, you can't claim to really know it until you have.
What about the other way round - "novelisations" of famous films or TV dramas?