David R, nah, I believe the ESP is programmed for other kind of conditions. It's done for Germans with their "winter tyres" which have no grip whatsoever. And ESP is then made a little too protective, to help novice drivers or something.
Every Audi A3 with ESP I've driven have had the same problem, it prevents too much. There's more grip available, but ESP won't let you use it. Also I don't think it does good job in 'falling snow' situation (meaning there's lots of packed snow on the road, which makes the car unsteerable since the snow crashes from under the tyres), in which taking ESP off might actually make the car steer where you wanted it to.
All in all, of course I use ESP, since it could prevent something with ice, which I can't see, but in packed snow, I think it's just useless piece of [censored]. Ouh yeah, nevermind situations where you get stucked with ESP, since it won't let your car move. Hiphurray.
Quattro might help a lot, since it can move power to other wheels, making ESP less useful in those situations. All in all, ESP is nice in ice, but bad in deep snow. Too bad, atm we have a lot of deep snow.
- Yak