My wife and I are ardent fans of The Witcher series. Sadly this prequel was not of the same caliber as the main series.
Firstly I should note that the actress who plays the dwarf character (Francesca Mills) was great. When she's in a scene everything works. The other actors felt mostly miscast -- in part since everyone looked different and has different accents. Nothing felt natural.
As for the story, I expect that I missed a lot since the writing was absent of the cleverness that I had come to expect; some ensembles just work, this one didn't.
We watched the 4 episodes in one sitting. At the end we were pleased that it was kept to only 4. At the end I was left with a mild headache and no interest in more. Easily forgetable. And as one reviewer noted, this series is very reminescent of the "Wheel of Time" series, similar feel and characters that felt miscast, yet even that series was better than this.