Dudes, I know the owner of the company is making those - watched some presentations of his where he mentioned it. But he's just not good at it. I'm sorry but how the models look and move is just ridiculously funny.
Just as an example look at the Dead by Daylight player movement which is using the same engine - https://www.youtube.com/watch?v=QP2sbkj_SsI it looks smooth and natural - legs, arms, face etc. Still not perfect but comparing it to Sandstorm's DbD's are godlike.
So my suggestion is that you hire some model animator with experience and talent.