Haven't read any of the books, but I enjoyed the videogame immensely. As other's already have pointed out; the stories of the three main characters begin at very different points in time. I can imagine this is not very clear for people that are new to the Witcher. That and some poor CGI in a few episodes (the Dragon was very dissatisfying) are my only criticisms on the show.

For the rest this show is amazing! The cast is very well done (other then Triss perhaps). Henry Cavil IS Geralt. His voice, the fighting, his very dry sense of humor. It's just right on the money. And not only the casting was done right; with the score, the cinematography and the monsters the world of the Witcher comes to life. A grim, war torn world where there is no obvious good vs evil, where only different shades of grey exist and every decision has a consequence.

Now that all the pieces of the story are in place and all important characters have received there background stories, I'm very much looking forward to season 2 where the main story can further unfold. The Witcher can really become the next big fantasy hit imo. The world and the story have the same scope as GOT, but none of the long-winded annoying side tracks. And of course the ending of the Witcher is BANANAS and deeply satisfying. Let's see if Gerarlt can become as likable as Daenerys.

Also there is plenty of extra background and little pieces of lore for those who already know the story. I'm really positive about this show.