Feeding only ground defeats a large portion of the benefits of feeding raw - namely the crunching action of eating bones. The bones are the reason that the teeth remain so clean, and therefore no doggy breath. Bacteria will also be present in higher amounts in ground food, simply due to an increase in surface area, and the mixture of parts that contain ample bacteria (it's why you can eat a raw steak, but should never eat ground hamburger raw).
I think there are plenty of people who feed both, but I wouldn't feed exclusively ground.