Huh, not to my taste. To me it seems like the ship is artificially 3D (can be seen right at the beginning) while the solid-color areas are incompatibly flat-looking because they don't have enough shading. The motion is smooth and expressive, I'll agree with that, though it's hard to appreciate when I dislike the style of the facial features.

I far prefer something like Log Horizon, and it's not even the most beautifully-animated anime out there, just the one I'm currently watching.

http://www.crunchyroll.com/log-horizon

I normally think of animation as being "the art of animation" including character design and color as well as motion. But it's true that the term animation refers to the motion as the identifying element. The motion is the hardest part to notice and remember though, at least for me personally. It's like how plot tends to be the invisible, taken-for-granted part of a story. I have great difficulty trying to cast my mind back over all the animation I've seen and pick out examples with good movement.

The examples that are particularly memorable to me usually end up being combat or dancing, though magic spell special effects can also have some great examples of movement. Actually, a good way to search for examples of animated series with good movement might be to look at music videos where someone has used a montage of combat or dance scenes from different series. Hmm maybe I will review my AMV collection and see if anything has particularly good movement...

Animation reached its peak in the Bugs Bunny/Road Runner era. It's been downhill ever since.

Samurai Jack may be a notable exception...