yes! Fo3 wastland was probably the most beleivable. People keep saying oh its 200 years after the war but its also been a couple of years since the vaults were opened so it makes sense not to have higherarchy but anarchy.
There were hundreds of Vaults. And a bunch of big cities in FO1 and FO2, even a city of Ghouls. Things progress, FO3 looked like maybe 50 years after the war not 200. Go check this out if you want to know more about the canon of Fallout http://fallout.wikia.com/wiki/Fallout_Bible