I don't have a Doberman, I do love my sister's girl, Vegas- but I don't have one. I probably won't have a Doberman for another few years, but I've met some really amazing people who are very active in the breed on this site and I've met others as a result of being a member of this site.
I can say, without a doubt, when I bring home the perfect puppy from a wonderful breeder, it'll be because of all the breed forums I've been a part of and all of the great people I've met through them.
And I think this site is most useful for the people who come and bother to read BEFORE they bring home a puppy, instead of trying to figure everything out after they already have a puppy from a bad breeder.