It's true that the games have serious deviation issues compared to books In my opinion. For example they made Geralt way too handsome (in Witcher 3). There are way too many monsters. Geralt would never (willingly) enter a plot to kill a king. He hates politics. And many more things.

Concerning your second point. Isn't that a good thing? I'm one of the people. I played Witcher 3 first, then read the books and then the show. For me it was better that way. Because now when I read a line I could hear the voice actors say those lines. I could picture the scenes in my head because i had models. It only enhanced the experience of the books.

If they had made the games more like the books, it would definitely have been worse or at the very least boring games. Can you imagine just hunting one measly ghoul for 30 minutes in one area?

I think people should just see the three as different entities with the Witcher Netflix series definitely being the worst of the bunch.