My next car will probably be (well hopefully), an E63 estate 4Matic as it would probably represent the ultimate every day type car for ME and my family. More importantly me

. 5 seats, hige boot, huge power when needed and AWD for all weather.
The wife has an X-Trail with auto AWD, 2WD option and lockable AWD and its very good in all conditions, although recently in the snow it didn't behave all too great (she was driving...), but I put a lot of that down to the lacklustre 1.6 engine cough cough. It handled far better than my E63 did, however.
Anyway for me its not about AWD as such, its about being able to plant that power down safely and enjoying the max a car can give and a 4Matic Merc, especially AMG variants, makes a lot of sense so I'm all for it. Although I'd like the option to disable it if possible.
Given the way tech is headed it won't be long until we get a car that is impossible to lose the back end in or slide all over and while from a driver's point of view that may make things a tad boring, it will allow the driver to maximise full use of a car's potential.
I had a Saab 9-3 estate and it handled superb in any weather, very little under or over steer or sliding about in ice and snow and I loved how I could drive that car hard regardless of the weather or speed. It stuck to the road, cornered great and made me feel very safe and assured as a driver that I could test the limits, or more limits.