Yeah there are some good things to be said about feeding a diet that is more natural, ESPECIALLY since almost all kibble most people buy is mostly filler(Check ingredients, it's listed by weight..a lot of them show grains and stuff first which means they are pretty fattening!)
I know some pure bred dogs honestly need a more varied diet of raw meats and other foods to help keep them healthy and prevent health problems associated with their breeds, especially big dogs it seems.
When my family gets a new puppy this summer, we plan to go with as close to a natural diet as possible!