S1 had three plotlines. The story of Geralt was fantastic. I would have liked an episodic series about his adventures with Jaskier. The story of Ciri was okay, but would have been much better if she had met and formed a relationship with Geralt sooner. The story of Yennefer was least interesting and I'm not sure why it was there.

S2, the quality of writing seemed to go downhill sharply. Bad dialogue and weak plot. Many characters from the books were rewritten or wasted, sadly.