The fact geralt didn't spam quen whenever he had a fight

IMO I think the biggest irony is that Geralt's quote about Jaskier's singing : "It's like ordering a pie and finding it has no filling" is an accurate description of the series.

Biggest mistakes: The nilfgaardian armor

Honestly, The actress that plays Renfri should've played Triss.

"The woman who can't pronounce 'Skellige'."


He's not going to let this go, is he?

I watched the show first and then I read the books. I really changed my opinion about the show after that. They did so many characters dirty:
Geralt: removing a lot of his dialogues.
Ciri: too old and cutting parts where she bonded with Geralt (as you said).
Cahir: too old and badass (and not good looking)
Triss: Shallow and nothing like in the books and games.
Fringilla: Evil and also way different.
Yeneffer: I just don’t like her.

Henry Cavill really carries the show on his shoulders.

"Who buries a baby under a inch of sand on the shoreline" - Especially in a World knowing of Necrophages and Drowned!

"Shorten the doppler plot" or just straight up remove it, cuz it made no sense.

Well, stuff that really pissed me off:

1) Geralt nearly crying over Yen (wtf!)
2) That last scene with Geralt and Ciri, taking away the emotions from the original scene from books
3) Geralt and Jaskier’s whole dynamic (in books, the Witcher actually enjoyed the bard’s company and actually respected each other, whereas on series, Jaskier follows Geralt like a flea everywhere)
4) Yen’s backstory, she was supposed to be this complex, mysterious woman like in the books, but they’ve decided to give her a backstory

the whole doppler and brokilon story in the show was completely pointless

The show feels a bit like a high-schooler attempting to summarise a book in an essay. They try hard, describe all the cool bits they liked but ultimately miss the more subtle but key aspects of the plot.

Biggest mistake : The golden dragon story. It litteraly was a speedrun of the story, and I never thought it was possible to make a dragon that ugly...

the woman who can't pronouce skellige is actually the main antagonist of the show

Geralt and Ciri met at the end of season 1 for the first time. In the original, in the book it was a heartbreaking scene, showing the power of Destiny. Because in the original, Geralt did not believe in Destiny, tried to return Ciri to Cintra, but then got scared, thought that Ciri was killed like all the children in Cintra. And yet, he believed in Destiny and the law of surprise, and they met.
Netflix disgustingly showed the meeting of Geralt and Ciri. Meeting without emotions. And Ciri's stupid question is “Who is Yennifer?”
original:
“You've finally found me! Oh, Geralt! I waited all this time! It took so long... We'll stay together now, won't we? Now we'll be together, right? Say it, Geralt! Forever! Say it!”
“Forever, Ciri.”
“It's just like they predicted, Geralt! Like they predicted... I'm your destiny? Say it! I'm your destiny?”
“You're more than that, Ciri. Much more.”

No. 1
geralt never said the line: "winds howling."

My biggest problem with the show is cutting off some of the story lines, especially Brokilon.
So far, this storyline is the most useless in the show.

There was an interview with Sapkowski and he said  "The process of transforming words into pictures cannot be done without some losses. But I’d rather keep the details to myself." That should answer the question whether  he liked the changes or not

My biggest issue with the show is not being able to use my witcher senses know what I can loot

The only major mistake is that they didn't include a godamn unicorn scene

1# Casting of Triss.
2# Making Yennefer feel like the main character rather than Geralt
3# Too few displays of how witchers work. If they had made more episodes like the one with the Striga I would have liked it more.