The G series Mercedes looks like a bus. It's not nearly as refined as it could be, to the point that it's not worth buying to your typical simple "expensive car buyer" because it's inferior to so many of them. The ML, BMW X6, Lexus GX and LX, and Range Rover* are all quite a bit more civilized. I know that only the G, LX and Range Rover are passable off road.
Don't forget that only about 5 percent of Range Rover drivers actually take them off road. I would think it would be a good deal less than that for this car, even though it is quite capable off road. Take it out of its element (read: put it on road) and it loses its edge.