This had potential, but terrible execution. Either make it a musical or don't, I personally despise musicals so I don't want to hear anyone other than dandelion sing, and I don't really want to hear him sing more than once an episode/movie.
Way too much stuff going on in the last 30-45 minutes, and half of it made zero sense. The only impressive parts of the movie were the first two monster fight scenes.
For the love of god, get LSM the hell away from all things witcher. She has ran it into the ground, and has no shame or accountability over that fact. Let someone with respect for either the books or the games take over, I don't care which.