I'll keep this spoiler free, and for some context I've not read the books and I've only played one of the games. I'd consider myself a fan and great appreciator of the franchise, but not a hard-core fan who knows all the lore etc.

To business then... Series 1 good points include lots of well defined, clear characters, a fair balance of sets without over reliance on CGI, interesting cross narratives and it seems to be written with respect to the audience members intellect (assuming they're not looking at a phone for half the story). It is something that those unfamiliar with the franchise will need to concentrate more on while you get used to names, places, nations etc. If I had to criticise it for anything, it would be that they occasionally lean a bit heavy on some comic relief from certain characters, but overall I think it was a very good first series.

Series 2. It definitely started well. Some good new characters, many of whom I expect proper fans of the franchise would had appreciated. But unlike the first series, I did find myself willing the story along at points. I like it when a story isn't all about action, and that time can be afforded to good dialogues and narratives for better character depth and development, however there were a couple of occasions where I realised I'd stopped listening for a minute. It did pick up again at the end, which probably made up for the lull. On balance, a good series and it had a lot to live up to from the first, but I think it was a slight letdown because of such a high bar from series 1. And one of the final scenes was great - feltna good sense of anticipation to see what would come next.

Series 3, which I just finished. So much of the story felt forced. The characters seem to lose their individuality and their behaviours are just to move the story along. The individual storyline of each character appears to be gone and they're all united in common (but slightly dull) purpose. Lines become more cliche, plot points and twists become more predictable and, worst of all, the writers have dumbed it down - there's a prolonged period where a character is alone in a desert and they can't just act like they're thirtsy, they have to say it aloud... while they're alone... with no one to hear them.

In summary, I think it all started very well, and I know I'm not alone on thinking it's taken a disappointing decline in quality. I hope series 4 is better, but if not then I think that'll be it for the Witcher for me.