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After watching all of the Lego versions of LoTR and The Hobbit, I now prefer them compared to any of the other film versions in the franchise. The animation style is super fun, and they even managed to use authentic audio from the "official" LoTR movies. Plus, they're great for younger kids because the movies tend to be pretty graphic. (Not to mention, Lego IS Awesome!)
One of the most compelling reasons, however, is the amount of humor in the Lego versions. Tolkien's books actually had a lot of really good jokes and humorous scenes, but the movies removed almost all of that. In The Hobbit book, the troll scene is lighthearted and playful. The troll's bickering, instigated by Bilbo, is hilarious. And it's comical listening to them talk about how to cook the dwarves. Their bumbling discussion buys enough time for Gandalf to intervene.
In Peter Jackson’s film, however, this scene is far more serious, focusing on the action and near-death experience. The dialogue between the trolls is much shorter, and much of the humorous banter about how they should cook the dwarves is reduced. The shift in tone makes the scene more suspenseful than funny, so it loses a lot of the charm and wit that Tolkien put into the original scene. There are also other scenes where this happened as well.
As another example from a different franchise, the Avatar the Last Airbender tv show was hilarious, but the Shyamalan version sucked all of the humor out of the show, making it dull and lifeless. While the effect wasn't so bad in the LoTR movies, it's refreshing that the Lego team added plenty of humor back in.