I have owned Volvo cars for the past 35 years, and never realy had a problem with traction, as Clive points out a lot is to do with tyres, and another key factor, driver ability and technique.
The snow we have experienced this year has caused no problems at all with my V70 phase 3, where necessary just put the auto girly tronic in to manual mode, and with a gentle right foot, traction has been no problem.
Prof, one thing I do not lack is driver technique and ability!
I won't go into my experience on here, it would take too long, but rest assured that the traction problem on the Volvo is the car, not me! I do accept, however that more aggresive tyres than the purely road-biased ones I have fitted may well help solve the problem.
Our access lane is very short, with a narrow bridge straight onto a 1:4 gradient up to the main road. The Volvo will scrabble for grip in the rain on this slope, and is the only vehicle in the 25 years I have lived here to have failed to get me out.
This is one of the reasons why my "spare" car is a Range Rover.
Going back to when the 850 first came out, a friend who had had Volvos for many years, expressed concern about the switch to front drive, and its affect on the car's towing ability. Nevertheless, he traded his trusty old 740 for a new 850. After bering towed on and off three rally fields in succession, he took it back, and was able to reverse the deal, as his 740 had not been sold.
No, I'm afraid I stick to my earlier statement that the Volv o estate is a prodigious load carrier, and great road car, but bottom of my list as a towcar.