Pretty good
I never knew this existed, however I did watch first 2 seasons of the live action show, before giving up.
This was a good effort. The animation is superb. The fight between Vesemir and Tetra was incredibly well executed. Very complex, but it worked.
This animated film is quite brutal and violent, as one might expect from The Witcher.
The music in this was too loud, and drowned put some of the dialogue. Also, some of the dialogue was hard to listen to, because it was really softly spoken in places, apart from the overbearing music.
The story was interesting, and having not read the books, not sure if this is part of the books. That said, it does present an interesting and really complex problem in Witcher lore.
Overall, a good watch.