Didn't have a blizzard here in east TN, but last week we did have some ice/snow, and the traction control/front wheel drive did help me get up a hill that I don't think would have been possible otherwise.
The two biggest advantages our DTS' have over virtually all other front wheel drive cars is the weight of the engine and the power. I've never been stuck in any Northstar Cadillac and I live in the Northeast. This past weekend we only got about 3-4 inches and I never left the house but no doubt it would have been a piece of cake.
Living in Northern Iowa, our 2006 DTS has seen its share of deep snow. The only time we ever have gotten stuck is when we go through such tall snow that we get hung up. If the snow is not so deep that it just lifts the car up off the ground, it will make it though.
We also have a 2006 AWD SRX that sits a little higher off the ground and have never been stuck in it. But that is to be expected.
We have Michelin Primacy's on the DTS and they are quiet, handle well, and go though anything that our car can handle.
that's the number one question what are we using for tire's. for the snow im using nokian wr32 works great wet ,snow, heavy snow, never had a problem thats the main thing for not getting stuck what's on your rim?????