I always loved the books and thought a fairly good job of translation was done, although there were a lot of problems.
The music was good and the casting excellent.
Some movies have great scores. My personal favorite was The DaVinci Code. Bad movie, excellent music.
The LOTR films were far better than I would have expected — although I am still irked by the portrayal of Aragorn as unsure of his role and unsure of his love for Arwen. Goes completely against Tolkien’s vision of the world.
I'd have to say the same about two sleepers: PeeWee's Big Adventure and A Series of Unfortunate Events (especially the ending credits).