Ple-Sen
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Why?
1. The plot was drastically shortened; Beorn and Bombadil were simply removed, even though both characters are charming and memorable.
2. At the same time, it's not entirely clear why this was necessary, especially since the plot was expanded with elements that weren't in the book, such as the Arwen/Aragorn storyline. This was only mentioned in the book's appendices, but it was absent from the main text.
The film itself is not bad, but as an adaptation, it failed.