I love driving the BMW 3 series, it was hard to keep the little 325 out of the hands of my kids as the were growing up. They totaled two of them for me (Other driver error) without injury, thank god for BMW's attention to structural integrity.
I found them difficult to drive in nasty weather conditions, however, even when equipped with blizzaks, and something about icy roads and an expensive vehicle to repair that adds anx to driving. They were optimized for the street and good weather. The seem to have just enough foul weather capability to give you a good shot at getting home to the suburbs when surprised by nasty weather. The Mercedes was similar.
For me, the JGC is a better nasty weather vehicle than the BMW SUV offerings by far, the 2011 JGC may even be more competent in heavy show than the 2010 even without the front lockers. Off road, no competition.
In the past, instead of swapping winter/summer tires, I've been known to just swapped cars. With the 2011 JGC I don't think I'll be swapping. It certainly won't handle the curves with as much pleasure as the 3 series, but it is competent, maneuverable in tight parking spots, and there is no issue on nasty roads. It will be fun going out on un-plowed roads and trying to get stuck (or rescuing others, typically soccer moms X3 or X5s
Oh, I like buying one jeep model or another for my spouse to drive, gives me piece of mind, as a nurse she has no choice to go out in nasty weather... come to think of it, I've taken her liberty out on several occasions to rescue my sister in-law's X5 and lexus after her boys tried to do some off roading in the mud.... or was that to find a private place to park...
You can draw class lines to include a wide variety of vehicles, but I don't think BMW (or Mercedes) have an offering in the competent nasty weather/trail riding class that also offers modern handling and convenience....