I think one may express which one they like better, this particular scene in the book vs. the movie, or maybe, what might have worked better in the movies/books. (Yes this can work both ways).
I think the MoS is an example of it would have been better to treat like the book. Where he rides back in shame, and the banter between him, Gandalf, and Aragorn I deeply miss. I would just find that to be downright better then Aragorn simply chopping off his head.
Then on the other side...
I like that PJ switched some lines around. For example, instead of in the book Gandalf saying, "Too long have you (Grima) haunted her (Eowyn's) steps...etc." PJ gives this line to Eomer, which I think has a lot more effect hearing it from her brother, then it does from Gandalf. (Although that is rather insignificant I just think that line works a lot better with Eomer saying it, instead of Gandalf).
What bothers me is when people try to take book occurences and explain why a particular scene doesn't work in the movie. I think if one is going to say why this scene doesn't fit well, they have to explain it within the movie's context.
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