Same sex aggressive dogs aren't necessarily out of control. When you have Dobermann males showing together at dog shows, or dogs working near each other on Schutzhund club grounds, you aren't going to get fighting. It's when they're let loose around each other that the problems come up. I know what you're getting at when it comes to say, dogs bred for dog aggression and fighting, but that kind of dog aggression is not the common kind you see in Dobes. I'm sure there are Dobes like that, but that is not what I have seen at shows, training etc. so far.
In regards to Schutzhund, I haven't seen any working line Dobes with troubles getting titles in Schutzhund. Getting angekört is whole different level, though, of course (for which Dobermanns requires a SchH-1 title along with having passed the endurance test to participate).
Can't say I have had problems with my Dobe's recall or obeying at a distance myself... ?