It all depends on how you raise this puppy. Yes, they do have a tendency to be aggressive but only if you raise him/her that way. Make sure your pup gets LOTS of love and attention. Go to puppy classes where you get your pup socialized with other puppies. VERY important.
I was at a dog park yesterday with my dog and saw two doberman's. Both full grown and with two different owners. I spoke to each and they both said that their dogs were extremely friendly and acted pretty much like babies all the time (meaning they like very much to be pampered)......both of them were wonderful dogs.