Hardly, The X5 drives like a 5 series and you can really throw it into corners with almost no body roll, when pushed really hard the back end will start to drift out just like a rear wheel drive sports car.
The weight of the 4WD system keeps the center of gravity low and the huge tyres find plenty of grip, its a fantastic car to drive as just about all BMWs are but like the rest of them its just not designed to go off the bitumen.
To beat it on road would take one of the new supercharged Range Rovers and they're twice the price of the X5. Obviously any Range Rover would beat it off road.

