I think that having the Ring-driven Grish would have added a lot to the story in that you wouldn't see Orcs as just being these mindless, slobbering idiots that the movie portraies them as. I can see though, how having him meat driven would help for those who have not read the books, it's less information to try to take in at once...I know I saw the movies before I read the books and I wouldn't have understood it at all. It does, however make Treebeard look stupid and makes Pippin look as if he can't think well in a tight spot.
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