I'm not sure how long this has been up, but it has two days left!
The Witcher 2: Assassins of Kings Enhanced Edition on sale for 80% off on steam, it's new price being $3.99, and the first game is also on sale for $1.99. So you'd be able to grab both games if you haven't already, especially since the third one is set to be released in February of next year, giving you enough time to finish both of these games.
I'd give you a comprehensive view at the Witcher, but funny enough I haven't actually played it yet. Now is a good as time as any. Though many RPG fans say it is an unmissable game for the genre, but that is something I'll just have to see for myself. I will tell you, that the Director's Cut of The Witcher is the uncensored version, so there's always that.