It's not worth it
Fans of the book series who haven't forgiven the showrunners for the significant plot twists in the second season can safely skip this new creation from Netflix, at least if they don't want to pour salt into their wounds.
However, even those who are capable of forgiving the original series for some of its shortcomings or even enjoyed it may not be able to fully absorb Blood Origin without consequences.
Source Material
The series is not directly based on Andrzej Sapkowski's book series, which is good on one hand as there is nothing to ruin, but on the other hand, the creators had the opportunity to completely unleash themselves from the chains. And today we know that they used this chance to the viewer's detriment.
The new Witcher takes place roughly a millennium before the events of the books, or the series.
It tells the story of a group of seven mismatched heroes who stand against a newly formed empire with the goal of completing their revenge and ideally saving the world.
We will witness the Conjunction of the Spheres and the birth of the first Witcher. It sounds quite good so far, but the opposite is true.
Quality
If someone expects Blood Origin to be as high-quality as its TV sibling, they will be very disappointed.
It's more or less a B-grade or C-grade affair that doesn't make any sense. We don't expect any tension, progression, or good character work here.
The plot drags and bores. The show seems entirely generic and except for a few names and events, has nothing to do with the original, let alone the brilliant book source material.
Acting Performances
The heroes are dull, and the villains are ridiculous. Their motivations make no sense, and there can be no talk of chemistry between the main protagonists.
Even Michelle Yeoh, who is usually excellent, appears to be a supporting player here.
There is no anticipation of good action scenes. Although they are slightly better than the rest of the show, this is not a compliment, merely an observation.
Choreographers didn't go all out this time, and the chaotic camera doesn't add much either.