While it's made huge improvement in just the past few years, AI still hasn't quite solved motion, especially human motion. The humans in these videos are rendered really well, but move unnaturally. Like someone did a motion capture of a real human, and then played it back with a very high quality 3d model--something hard to describe is lost in the processing. Everything seems to move just too smoothly, at too exactly constant a speed. Same for camera movement. A real life camera doesn't precisely follow some exact 3D Bézier curve at an exactly constant speed. AI doesn't get this yet.