There is some logic behind all of PJ’s decisions to date, in terms of the way movies work vs the way books work. Let me just try to justify some of Equipoise’s list:
Sarumman/Gandalf confrontation: I lament the loss because it’s such a wonderful, wonderful (and memorable) scene in the books. It was cut from TT for being anteclimactic, and I knew, way back then, that it would therefore not fit as a beginning for RotK – it’s the conclusion to the other story, not a beginning for this one.) I’m bummed, but I understand the movie logic. Books can have anteclimaxes, movies can’t … not well.
Absence of the Voice of Sauron is also reasonable. It creates a lot of suspense in the books because the reader has to wait for a while to discover how the Voice got the mithril coat etc. In the movie, where the action is intercut, there’s no such suspense and the scene (while dramatic) is thus easily cut.
Gollum’s sneak attack gives away too much, mainly Frodo’s warning/prognostication gives away the Mount Doom ending.
Elimination of funeral of Theoden, crowning of Eomer, and minor characters are not major losses, they can be assumed.
Elimination of Shagrat, Gorbag, and marching with orcs – I’ll have to wait and see how they work things out. There are several ways of doing the same thing, and frankly, the way they’ve depicted things, it would be difficult for Frodo and Sam to be disguised as orcs anyway. I mean, how convincing would it be? Visually, I don’t see how it could be worked out.
Faramir/Eowyn romance – They’ve put all the romance emphasis on Aragorn/Arwen, so the secondary romance is not critical. I’d think they could spare a line of dialog or a romantic look between the two, it wouldn’t take much, but there we are, I’ll have to wait and see how they resolve Faramir’s and Eowyn’s stories.
OK, my opinions. Books and movies are different – they do different things, they show the story in different ways, and no one should expect them to be the same. The movie will never be the same as the book, and vice versa. They can’t be, never, not for any book.
PJ has done a wonderful job of adapting the story so far, and I assume he will do the same at the end of all things.