This show has a terrible problem of casting, actors and actresses can't act all, they are stiff, no emotion is conveyed and lines are delivered as if they were robots at times; also, about the miscast issue, we have ethnicities changes within the characters the most prominent being Fringilla Vigo, Netflix do you want an honest opinion? Create an original character, rather than changing how a character looks.

Another issue was how they changed the story - another argument for the original character, if they can "adapt" the source material, they might as well add new characters to suit their need of representation on their series -, specially when they didn't show Yennefer of Vengerberg magical prowess and felt like diminishing Vilgefortz's relevance on the Battle of Sodden Hill, just to use Yennefer as their trump, when actually Vilgefortz was both the strategist and the one of the strongest out there - and he was beaten by a human, just to give you an idea, Vilgefortz overpowered Geralt in battle.

They probably had low budget for CGI because they are rare and tend to be quite poor, one of their strategies is to use it at night or dark places so we can't tell how bad it really looks, but the dragons are a perfect example of how poorly delivered the CGI was, not only that, those "dragons" were the same size, or maybe a bit larger that a common drake - another creature from the stories, imagine a smaller dragon.

Writing was terrible, we have several moments with flashback throughout the series, and sometimes even within the episodes, so it becomes rather difficult to tell apart which moment of the story we are being shown, specially when at any moment whatsoever the series show to us which year we are in.

There was some make-up issues too, for instance Geralt's wig sometimes look like real hair, but other it is so obviously a wig that hurts, Ciri's lenses didn't adapt to the actress' eyes and we couldn't see he pupil react like they normally do, that's why some people find her eyes "strange", there was also Yennefer's eyes which were clearly painted - unlike Ciri's lenses - in post production and they also feel unnatural, specially in scenes when we get to see how, say, Tissaia's eyes react to the environment showing light reflections and Yennefer's eyes don't have no reflection at all.

Good things:

The swordfighting was beautifully choreographed, it is pleasant to see