It's more of a fan fiction than adaptation. Netflix witcher series have very little in common with... Well... The Witcher... Except for some character names and not even their appearance or personality.

The dialogues are so pathetic they sound as if they were written by a child (no offense to children, they can be brilliant and far more creative than the authors of this garbage).

And last thing I want to say is that I doubt that any high rating given here belongs to a person who read the books or at least knows the universum's basics.