Forbidden is definitely the correct word to describe it! It gets worse during the second half, dear lord. Tony Martin's vocals lack finesse. They sound weak on every song which is a crying shame. Ozzy had a booming voice that took control of each track, this is more power ballad than metal.
There's one decent song (Shaking Off the Chains) but everything else is filler. A terrible album indeed. Not even Tommy Iommi could salvage it.
As for St Anger, I found it to be garbage. Only lasted four songs before giving up, but you've convinced me to give it another shot. Surely it has good parts right?