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Regarding the translation: in the second part, Middle-earth is sometimes referred to as Earth.
In the book, this is only in the third part, but in the appendices, it is very well developed, and in the film, the appearance of Arwen is justified.
Furthermore, I'm tired of defending Jackson on various forums; he didn't make a perfect film, and purely Hollywood moments occasionally appear. But!
He managed to:
more or less select the actors.
convey the main plot of the book.
convey the main atmosphere of the book (albeit sometimes clumsily, but still).
make money (he is, after all, not an altruist).
I also enjoyed the Nibelungenlied; it's an excellent adaptation.
I would like to hear your opinion on the adaptation of "The Master and Margarita