Well if this isn't the biggest come back since Jesus then I don't know what is. After two decidedly non-metal albums 1976's Technical ecstasy (which is without doubt the weakest album of the original line-up) and 1978's Never say die, Sabbath returned with new singer, Ronnie James Dio and made not only one of the best albums of their career but one of the best metal albums.
This was the album that introduced me to Ronnie James Dio, and of course he is one of the finest singers of all time but completely different and therefore not comparable to Ozzy. Because of Dio being in the band he has a great impact on the sound and style, and for the first time on a Sabbath record Geezer Butler doesn't handle any of the lyrics, he just plays some phenomenal bass (no change there then). Heaven and Hell is the only Dio era Sabbath album to feature Bill Ward on drums, but as with the rest of the band he gives an amazing performance and shows just why he's one of the best drummers around. As with all Sabbath albums Tony Iommi writes the music and absolutely slays the competition with his rhythm and lead work. Also of note is that this is the first time Geoff Nicholls provides keys (which are never overpowering but simply provide subtle textures ever once in a while) and the first time producer extraordinaire Martin Birch worked with Sabbath giving everything a crystal clear yet heavy sound.
The songs on the Heaven & Hell album are really something special absolute metal classics. Children of the Sea, Neon Knights, Heaven and Hell and Die Young are among the best Sabbath ever wrote. On the whole the song writing is excellent only the slightly sub par Walk Away lets the side down.
So in Conclusion, This is one of the best albums ever, not that the Ozzy only fools would tell you so, they called it Black Rainbow, but listen and see that this is nothing but pure Black Sabbath.