I liked the Extended releases, as they almost serve the purpose of making entirely new movies. Two Towers is the most dramatically changed, because the added scenes alter the pacing. I also loved the opening of Fellowship, retracing the book's "concerning hobbits" introduction. That said, I'm not sure ROTK needed to be any longer...if anything, they should have ended the theatrical cut after Aragorn is crowned, and left the Grey Havens for the Extended version