Fantastic show. HAving only played about 2 hours of the Witcher 3 game, I went into the show with a fairly open mind and not a lot of back story about the series. I have to say that I was blown away, the cinematography, the fight scenes and Henry Cavill's performance as Geralt makes this series.
Whilst I can understand people comparing this to Game of Thrones (of which I myself was a huge fan before season 8) I think it is unfair to draw a comparison between the two. They each standalone on their own merit (except season 8 of game of thrones) however I can honestly say that the Witcher has filled a very large "Game of Thrones" shaped hole in my viewing world.
I cannot recommend this highly enough, if you havent watched it yet, i strongly suggest you do!