shadowguard: Here are screenshots sou you can see how it works.
Doesn't really prove anything one way or the other... the visual bugs and such would not appear all the time or even most of the time.
For example one of the few games that had a really low FOV that bothered me was Turok, the 2008 game. There is an FOV hack that lets you increase the field of view, but after playing for a while with the hack applied I noticed that distant textures did not appear right, for example walls popping in out of nowhere. I also noticed during cutscenes that sometimes a character's legs were down in the ground, or that a character was walking without moving his legs because originally they were under camera.
These kinds of little things are what I would look out for in The Witcher 2, especially in cutscenes. Maybe it's fine, maybe it isn't.