Not only one of my favourite Sabbath albums, but one of my favourite albums of all time, I really do think it's that good. It was one of those albums that I bought just to complete my collection many years ago, listened to it once and put it away (initially it didn't really grab me), only to come back to it recently and my jaw dropped! With more listens it grew on me and now I'm hooked.
Unfortunately this album will always remain underrated and largely forgotten due to the fact that Ozzy isn't on it. Tony Martin has never sang better or even as good as this in my opinion. If you're a die-hard Ozzy or Dio era Sabbath fan, and this just simply isn't Black Sabbath to you, just forget that the band is called Black Sabbath. It's a fantastic album in it's own right, no matter what the band is called! And I agree with another reviewer on here, Iommi is Sabbath anyway, and this album is full of classic Iommi riffs and Butler bass-lines. The drummer isn't bad either.
If you don't have this album in your collection, there's definitely something missing and you need to fill that space now! Trust me, you won't be disappointed, whether you're into metal, rock or just great, catchy, well-crafted songs. Buy it!