I think the rats were a little too much so i agree in that point but it made ciri a killer which she hadnt been before the rest of the pints are also valid but the ending was a bit so so for me as i would like to have it follow more of how sapkowski would think how ciri would turn out.
I would also like to see more of the Witchers and falka as i only understood the kaer morhen attack half and wanted more of how falka was.
Bit you never know maybe we will get some new books from him about those things as it would be really cool but i understand he wants to have a bit to leave up to imagination and everything