Animated movies are usually going to look and sound brilliant just cos of the nature of being animated -- ALL sights and sounds are created from scratch, so they can be made to look and sound perfect. I'm sure this isn't true of ALL animated movies, but a lot of them, I'm sure.
In terms of live-action Blu-ray movies, I've been 100% impressed with 2001: A Space Odyssey, Quantum of Solace, and the first Transformers movie. Visually and aurally, all three of the movies were completely stunning.
cheers,
supervij