I think it's important to understand bloodlines and study individual dogs equally. It does come down to the individual dog but I do think there are some generalizations that could be made in terms of what to expect if you're new.
Just out of curiousity, how many puppies have you bought in your life? How many dogs have you raised? How many have you trained?^ definately , the dogs first of all must be good producers, thats why i prefer buying a pup out of repeat matings. pedigree for me is important because in a puppy i cant test for certain things. for example i can test for prey drive and nerves but i cant test if the dog is going to be more social or civil, be dominant, defense drive, serious, have handler aggression. and ofcourse not all pups are going to be equal but certain lines are known for producing a larger percentage of a type of dog. As a person who prefers purchasing a pup at 8 weeks, pedigree is one of the key factors for me in choosing my pup, it helps me make an educated guess
Just out of curiousity, how many puppies have you bought in your life? How many dogs have you raised? How many have you trained?