How good on a scale of 1/10 are AWD bmws on ice/snow?
Interesting question! Unfortunately, I'm not sure what BMW you're referring to. With factory tires (non-snows), a BMW Z4 convertible isn't going to be very helpful on ice or snow. However, a BMW X5 with all-wheel drive will perform pretty well. If you're looking at a 3- or 5-series, these cars can be had with BMW's xDrive all-wheel drive too, so they should also perform well. At the end of the day, however, if you're going to be driving on ice and snow, you should always consider buying a set of snow tires. Even on a rear-wheel drive car, snow tires can help you generate better traction, improving both acceleration and braking.
Our E39 5 series is great on the snow. I've heard from several other E39 owners, as well, and with snow tires, they almost out perform a 4 wheel drive SUV! And that was coming from someone in Michigan, to give you some perspective. BMWs are very good cars for snow. But it does still depend the model. Something like a Z4 will not perform as well as a 5 series, or even a 3 series.