Yes, very true. The first Witcher game was an absolute smasher in Poland, as the books are one of the most popular Polish saga. The games are continuation (unofficial) of the books and the first one was co-written by Andrzej Sapkowski, the author of the Witcher saga (7 books in total), thus retaining style, humour and atmosphere of the literature. The 2nd and 3rd games were not co-authored by him, but they still keep up! If you liked the style of writing, humour and general flow of the games' story, you'll love the books!
Ah, please don't mention the TV mini-series it was a disaster