It is a decent port. But it have some issues. First is that if you put vsync on you get a max 30 fps cap. The solution is to force Vsync in nvidia control panel instead and enable tripple buffering. That is the major technical aspect I have to complain about.
As for the game. Well. I am very disappointed. You are pretty much railroaded through the whole game, and when you are not fighting something, it is childish farts and low based humor. It has its moments. But I would not pay full price for it again. I would recommend until steam has it on some sort of deal. It is not worth its current price IMHO.
The Witcher 2 is a far better RPG / Action experience.