I'm not going to repeat myself pointing out why I thought film Gimli was great etc

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But, I would like to point out that Tolkien's books are more popular than ever because of Jackson's films. And there are a few old codgers like me who have read the books many times over the decades, and still think Jackson's films captured the books brilliantly.
Yes there were some changes, but seriously, most film adaptations are DRASTICALLY changed from the original sources. As a Potter fan I can attest to how much film-makers have been forced to leave out due to time constraints (the Potter books are laaarge books). Some of the Potter films seem to have less than 50% of the original material.
Jackson's films (particularly the Extended Editions) on the other hand, keep 70-80% of the original material relatively intact, though some of the various actions are shifted around. As far as I'm concerned that's pretty faithful and sets a new standard for adapting fantasy books.
And the fact is Tolkien took a lot of heat from book critics in his own day. And it;s not that the writers in their commentaries on the EEs think that Tolkien's work had shortcomings, it's that they knew some things that worked in print for Avid Readers, wouldn't necessarily work so well in a film that would also be seen by a GENERAL audience, half of which haven't read the books, and half of that group would NEVER read the books because they just don't read period.
GB