I enjoyed the book for what it was - entertaining brain candy. I also marveled at what I perceived to be the author's formula. It appears he decided to make a character which took traits from the three main heroes of The Lord of the Rings - Aragorn, Legolas, and Gandalf and combined those aspects into his new hero - Geralt of Rivia - the Witcher. Then the author dropped his hero into a series of Brothers Grimm fairy tales and made the adventures more "adult" in nature. Genius!
I'm now a couple of episodes into the Netflix series The Witcher and am enjoying that as well. The next book in the series Sword of Destiny has already been ordered.