I finished it last night. Wasn't impressed. I think it was trying to be the "next Game of Thrones". What show these days isn't?
But whereas GoT was brutal, there was still some humanity in it. The Starks, Daenerys, even Tyrion, were trying to be decent human being despite the situations they were in. Yes, they got brutal sometimes but, in the end, except for Daenerys, many of their decisions made sense whithin the framework of human reasoning. In the Witcher, the choices seemed more plot driven. Except a few, none of the characters felt even slightly human. The Queen who wanted to kill her daughters "beau" just went straight to that decision for plot drama and not much else. The "Teacher" who taught her students the hard way by actually letting them get hurt was a similar thing: let's just do the worst to these people for drama's sake. There was, as far as I could tell, no "human" motivations behind these characters, just plot driven ones. I doubt I'll even bother with season two.