This game is amazing. Great story, graphics, music and sounds. You gotta make real choices that impact the ending. Gameplay is fluid, smooth and solid with great animations. Speech and facial animation feel natural.
Fabulous engine, short loading times and no loading between interiors and exteriors.
Although witchers have no emotions, this game will give plenty to you with its awesome story.

Very few bugs, nothing game breaking, all of them fixable by reloading the game. It's more an annoyance than a problem.
I can't point a flaw in this game, and this is really, really uncommon nowadays, unfortunately.
All in all, highly recommend this game, even if you never played the series, like me.

Go for it! :)