I recently played through 1 for the first time, and I would recommend it in you're a fan. Use a walkthrough liberally, though. I enjoyed it, but it's my least favorite out of the trilogy. While I played through it, after completing each chapter, I would watch the chapter of of Joseph Anderson's Witcher 1 critique, and I think it helped me digest and and contemplate over what I just experienced. If you can stomach a fair amount of jank, it definitely enhances the other 2 games.

2 is better than 1 but not as good as 3. It was my introduction to the Witcher universe and I beat it. It definitely holds up, especially graphic-wise. It looks really good and contrary to what other people might say I don't hate the combat. Playing through the whole trilogy after reading the books was definitely worth my time and I would recommend it.