To me there is some confusion as to how Ghouls(PCs or Critters) resolve Combat against Astral opponents.
According to p. 193 of SR4A "Astrally perceiving and dual-natured characters use their Physical attributes and skills to fight opponents with a physical body, and their Astral Combat + Willpower to fight wholly astral entities" This should include ghouls or at least the PC variant since they are dual-natured characters.
There is however a different rule for Dual-Natured beings with a Natural Weapon (which includes both types of ghouls): "If the critter is dual natured, Natural Weapon may be used with the normal Unarmed Combat skill and physical Damage Value to perform attacks against astral opponents (within reach)."
So which is it? Are only PC-Ghouls particularly screwed?
As a side note, what about the Natural Weapon itself? It seems to have some kind of mystical property so does it pierce Immunity to Normal Weapons? how about the absolutely mundane clawe and teeth of a dog? They are also considered Natural Weapons so can a dog easily chew through spirits?