I agree with Lathriel, I didn't have a clue who the actors were, so it was refreshing to see new faces.
Viggo was really good, he fit the part very well.
Cate was equally good, one of my friends totally freaked when she got tested by the ring.
I think that Elija did well changning Frodo on his way to Mordor, because, he did go through quite a bit of change. Such as, partial insanity?
I LOVED Sean Astin, he was GREAT!!!!!!!
SEAN BEAN ROCKED!!!!!!!!!!!!!!!!!