It would have been really stupid if Sauron had suddenly gotten a body and come to fight Aragorn. But people who hadn't read the books probably would have loved it because everyone wants more fighting time for Aragorn and all the other hero people, and it would have been cool if it wasn't just so made up.
My friend (who's halfway though the books and is too lazy to finish them I might add) said that the audience on opening night started cheering when he took down the oliphaunt. I was glad that I wasn't there.
Has anyone else noticed Legolas doesn't do ANYTHING? He's probably the least important person in the fellowship, and he has about 10 lines in RotK. Not much to get excited about.