OP...the truth is, your dog came from someone like you, who purchased a GSD and at 6 months decided it was the greatest thing since sliced bread and that they would breed it. They just weren't "lucky" enough to stumble upon this forum, or accross people that are really involved in the dog world to rip them a new one. If you look up previous "I want to breed my dog" threads, you'll see that it happens so often that people just don't have the patience for it anymore.
The way I try to explain it to new members of my GSD club is that, when you ask someone about your dog, you will get the honest, objective, truth about your dog, with absolutely no sugar coating. They will tell you exactly how they feel about the color, structure, temperament, ect of your dog without any consideration that this is your beloved family pet. We all look at our dogs as family members, some of us as kids, but the dogs are still compared to one another more like property and not as gently as children would be.
Kudos to you for sticking around and learning/understanding why people are saying what they are. No one is judging you, or your dogs ability to be a great family pet, and its ability to love you and be everything you wish it to be, they are just judging it based on the fact that there might be one next door that has something better to offer the dog world as a whole. Once you think of the numbers, and how quickly a genetic line can spiral out of control, you'll understand. If an average litter is 6 puppies, and even 2 of those pups are being bred, in a very small amount of time you have almost exponential growth of a line that isn't proven, isn't exeplory, and might not even be to standard due to the lack of knowledge/experience on the owners/breeders part.