Really? I disagree. Yes, Glorfindel is a bad ass. But I felt introducing him only to have him disappear for the rest of the novels was horrible move on Tolkien's part.
Giving the role to Arwen not only gave us another heroine rather than a damsel but it made her more important to the story.
Anyway, my biggest gripe is they had the Army of the Dead come to Pelennor rather than the Dúnedain.
I think that the scouring of the shire should have made it into the last movie. I know that some think of bombadil and others but this would have involved characters that we are familiar with and would have given a proper indication of how far Hobbits had progressed in terms of the bigger picture of ME