Jenn, I really don't think since you haven't owned dobe rescues or worked with them, that you have any idea really what owning one is like. They are no worse and no better than a breeder dog - getting a puppy is certainly no guarantee how it will turn out, ESPECIALLY considering what hellions doberman puppies can be to raise, how many of them end up in rescue (yes, even from so called "good" breeders) -
getting an adult rescue is often the PERFECT situation for many people to find out what the breed is like. adult dobermans can be temperament tested and you KNOW what you are getting. the dog wont end up dog aggressive, wont end up eating the cat, wont end up being afraid of car rides - if it isnt already! you get an adult dog, you get a dog that you can evaluate and figure out what you are getting in many situations. with puppies, sometimes you can do your best to raise them, but it won't change things (like dog aggression, fearful personalities, etc).
ive adopted 3 adult dogs (2 dobermans) and one younger doberman (a total of 3 dobes) - and each one was exactly what they were when i looked at them. i could see their issues, see where they needed work, see what was perfect - to the extent that one can ever know these things (some things about a dog you can NEVER know).
i think LESS dogs would end up in shelters if instead of being so enamoured with puppies, people made the right decision and used their heads instead of just their hearts, and adopted an adult dog when it was better suited to their life. assuming all adult rescues that get adopted have issues is doing a big disservice to doberman rescue.