Not a perfect show, but it's so fun that I don't care. Just some confusion as far as the timeline, really. It's fine that flashbacks are mixed with with the rest of the story, but confusion comes from some of the characters not appearing to age even over many decades, which is because they are magical folk.
I think this aspect of them might've been hinted at, but it can be confusing even to those of us that are somewhat familiar with the characters.
I've heard some critics aren't happy with the heavy use of female nudity, which I get because it turned me off of the video game where I never got used to Yennefer being naked for such a long time at the beginning of the game. It made it hard for me to connect with Geralt even 20+hours into the game, but the TV series makes me love Yennefer... it makes me wish the video game did the same for me.