tl;dr Netflix have done a fantastic job on the Witcher stories with their season 1.
Worth a free trial if you're in to the stories. If you've just played the game and not read the books, you might have to make the leap of a couple of episode... but well worth your time though.
If you're not in to either story or game: skip. It's not HBO matrial (GoT)... though I reckon it has its own charm.