Advent Children was Crouching Tiger Hidden Dragon mixed with Square-Enix. At least the directors realized that they had to exagerate the action, admitting that they could have just put in live actors otherwise.
I have to agree about replacing live-action with this. I didn't see anything striking as far as composition, nothing jaw-dropping, just a bunch of cramped scenes with CG characters making disturbing attempts at facial gestures. It's cool to look at for the first five minutes, then it becomes a gimmick and everyone begins rolling their eyes and leaving the theater.