[Sir Kohran]

Personally, I can't see Glorfindel working at all well in a movie like this.

Firstly, the idea of giving his role to Arwen isn't as bad as everyone says it is. The idea is still the same in the book - an Elf comes from Rivendell to help Frodo and his companions. Then the Elf takes Frodo to the Fords of Bruinen, where Frodo passes out as the Black Riders are swept away.

And it's a good way to introduce Arwen as a character - simply having her appear in Rivendell and have her in the same place for the next three films simply thinking of Aragorn would be rather boring. The scene gives her a bit of importance, too - she's not just a princess in the tower waiting for her prince to come; she can hold her own too.

Also, as a character Glorfindel's fairly redundant - he's just another male Elf warrior. In the films, we've already got Legolas, to a lesser extent, Haldir, and Elrond and Gil Galad in the prologue to show us how well male Elves can fight. Adding in yet another golden-haired Elf with a blade and a tendency to lay waste to the enemy would seem rather pointless - especially considering that he only appears in the first movie.

Now, I DO think it could have been done better. Did we have to have Arwen taking all of the glory? Gone are Frodo's words of defiance and Aragorn and the Hobbit's attack on the Wraiths from behind, driving them into the river. Instead Arwen does everything in the final confrontation, which doesn't seem right - these creatures have been built up throughout the last hour, and then they're defeated in a few seconds by a single character. I think Jackson could have handled this scene a lot better.

However, I don't mind this change overall - I think it was a hard choice for Jackson either way, and he did well enough under the circumstances.