Having just voted in the similar Saxon thread, the criteria needs a category between good and great. I voted great as this is better than good, but it isn't great by Sabbath and Gillan's standards. Zero the Hero is certainly a great track, while Trashed, Disturbing the Priest, Hot Line and Keep it Warm are not far behind. Gillan's blood-curdling scream and Iommi's hammering guitar work go perfectly together. This lineup should have persisted for at least one more album.
Admittedly, Stonehenge ranks with FX, as grandiose padding, and the production, even on the 2011 remaster, is horrible. Nevertheless, the Reading Festival version of Hot Line, available on disc 2 of the remaster, is heavier than the album track and shows what this band could have achieved given time.