[Gennie]

While most German Shepherds are naturally aloof, there are more than a few that are fairly friendly, including my own. I imagine a tracking dog would need to be this way, unless he’s supposed to eat those he’s meant to track lol.

[American Constitutionalist]

" While most German Shepherds are naturally aloof "

To strangers, yes, to the whole family ? no, they are loyal, and radically protective of their owners, and family.
Some people think the dog goes crazy and might have rabies when someone comes near the house or car, but, the Shepherd's natural instinct kicks in when strangers who are unwelcome approach the house or car, but, they are not going crazy when they bark, or show their teeth, and are aggressive towards strangers, they are protecting those the dog loves.