I saw a youtube video I think, that was saying how in the West, they nailed CG because they had the early example of Pixar/Toy Story, and so basically after that everyone went "oh that's how you do CG" and just emulated that general aesthetic, whereas Japan never really had their "killer app" so to speak, and CG's been more hit and miss, and the video came to the conclusion that American CG animation is just objectively better based on that.
However, that Pixar looking stuff sure gets samey after a while. Not having one "proper" way to do something can be a long-term advantage, because you're more free to break conventions. Sometimes having a really good example come up too soon can be a bad thing. If you look at American full CGI movies that try for any sort of photorealism, they basically don't exist, you need to look to Japan or elsewhere for those, Final Fantasy VII: Advent Children for example. Or all the weird variations of cell-shaded 3D in Japan, and character designs ranging from cartoony to anime-esque to realistic. If they had in fact had an all-Japanese equivalent to Toy Story then those oddball uses of CG might not even exist in Japan today.
(btw we've has this debate before, and when comparing movies from east or west it's important to take note of relative budgets. Toy Story 3 for example cost $200 million vs Appleseed's $10 million. No shit Appleseed doesn't look as good. You wouldn't get a $10 million CG film in cinemas in the USA, so comparing them is like comparing box office movies to direct to DVD movies).