I have. I liked it. Of course, I was 16 at the time.
I liked it, too, but I was also young when I saw it, plus I'm a cartoon nut :) I thought they did a good job on the part where Eowyn slays the ring-wraith. Roddy McDowell (Cornelius!) was good as usual as Sam, and some of the other character voices were also good--Otto Preminger, John Huston, Don Messick, Orson Bean, Hans Conried--actually pretty star-studded. But Casey Kasem as Pippin and Glenn Yarbrough singing "Frodo of the Nine Fingers"--okay, some of it was pretty bad :) But the orc song "Where There's a Whip, There's a Way" rocked :)