First off, I have no problems with people having 4x4s who actually need them, but the school run mums in their Cayennes,X5s,Q7s and MLs (and living in Cheltenham, theres more than a few)should be banned!
The only cars I saw having real problems out in the slush today was the X5s and the like, and mainly because they come on stupid 20" alloys with tyres wide enough to be classified as construction vehicles. You won't see a Landy with that kind of setup on it.
Has to be said that the driver makes a massive difference, I saw a Mitsi L200 4×4 spinning all 4 wheels earlier away from the lights, cock!