IMO, poor breeding is not doing research on each dog before you breed it. Were the parents healthy? Grandparents? Have the dogs had their eyes/hips/hearts/etc checked? Is there a need you're filling by breeding these dogs? Are you improving working lines? Are you improving conformation? Temperment? Are you breeding "just because" or because you think it'll be fun? If you're not breeding purebred dogs to better the breed, do you know that there's already a huge overpopulation of mutts out there? Not that mutts aren't good pets, but why do you need to create more mutt puppies when shelters across the country are chock full of them? Are you breeding "just because" your dog happens to be registered? Are you breeding to make a quick buck? If you breed your dogs, would you be willing to take all the puppies back if their new homes didn't work out?
It all boils down to the reason for breeding. What is the reason? IMO, all breedings should have a purpose. If it's just to make cuddly puppies, there are already tons of homeless cuddly puppies out there.
And yes, we got so many different breeds today by crossbreeding. BUT- just because you cross a poodle and a lab doesn't make a labradoodle a breed. Labradoodles are mutts. They won't be a breed until there is consistency and until you can breed labradoodle to labradoodle to get a labradoodle. This is what gets me. Labradoodle (and most other "poo" dogs) are marketed for being hypoallergenic. Uh, well, there's NO guarantee. Some won't shed, some will shed a little, and some will shed a lot. There's no guarantee of temperment. Some may act poodly, some may act labby. Breeds are created once there is consistency among offspring.