Aside from the choppy frame rate, I think way Geralt controls is a design choice, in the same way killzone 2 was. As opposed to just being broken controls that some people are complaint about.
If you say move the analogue stick slowly to make him walk and then release the analogue stick, Geralt takes a split second to stop walking due to momentum built.
I do feel that over time people will get used to it if they give it a chance. I remember people complaining about killzone as again the momentum etc felt odd when compared to other games.