I've said it before and I'll say it again - CGI absolutely can look good if the people utilizing it know what the fuck they're doing. Knights of Sidonia has fantastic actions scenes using almost entirely CGI, albeit with clever tricks to minimize their reliance on the jerky motion.
This does not, however, apply when it's being used to animate characters. Never do that.

The posing here looks horribly stiff and unnatural. This is a persistent problem throughout the series. Additionally, WHAT IS WRONG WITH YOUR FAAAAAACE?