I've only had a minor problem related to the Graphics card not being properly initialized upon loading, it required that I go into the video card options change a setting in the advanced section and click apply.
That's the only problem I have had with the game.
I certainly had more game stopping bugs with BG2 and NWN.
The game itself, I like, it's fairly polished, the combat is better than oblivion, it's very entertaining, the game is not nor does it try to be a hardcore RPG, I do like the award of skill points for objectives, opposed to kills.
It's fun, the most fun I have had in a long long time, and more stable than gothic 3.