I have an Audi A4 Quattro AWD without traction control and I can tell you from lots of experience that this car is unbelievable in the snow. We just had a 3 week long series of storms in Vancouver, BC and I was literally plowing through foot deep snow. Many times I pulled over to help push people out of the snow and I would park the car in deeper snow than they were stuck in. I never got stuck once. I agree that if you had one tire on ice it would spin but in real life driving situations the car was amazing.

One piece of advice is to avoid wide tires on snow/ice and use winter tires, not all season, for max. traction.