I honestly haven't read the books, but I base my review on the game The Witcher 3.
Starting with the game, The Witcher 3 has probably been the best well rounded game I've had the pleasure of playing. The story is unbelievable, the voice actors do an incredible job, overall my favorite game.
Now the series. My expectations were high because of the game, but it didn't fall short. You can't complete a story in just one season alone, but it honestly does an amazing job. Granted, the visuals aren't there yet, but plenty of incredible series start off like that.
The story line is there, the acting is there, actors were perfect for each role, and they do an amazing job at portraying their mysterious nature. Can't want for the second season, im site they'll do a great job.