Ronnie James Dio is part of that second-best singers club among elder metal gods. This includes Sammy Hagar and Brian Johnson, which is impressive company, of course, but there's a reason why this project isn't called Black Sabbath, and that's to preserve the Ozzy brand even though this is the exact same lineup as Sabbath's early 80s incarnation.
While Tony Iommi churns out stock riffs, Devil You Know's success largely depends on whether you can take Dio seriously - not as a vocalist (he's one of the best in the metal game), but as a diminutive old man bellowing innocuous dungeons-and-dragons lyrics, and so unconvincingly that you have to wonder if he actually believes a single word. This record doesn't make a strong case.
Top track: Eating The Cannibals.