I absolutely love Dio's Black Sabbath album `Heaven and Hell' it is an absolute classic, almost up there in absolute brilliance with Black Sabbath's first four albums and that is strong praise indeed. `Dehumanizer' doesn't quite reach those heights, but it stamps all over the unimpressive `Never Say Die!'
As an album there are some patchy tracks, some are just plain boring and some just seem a bit dated, trapped in the early 90's from which they were spawned, it's a bit odd considering their 70's stuff still sounds fresh. Still how this effects your listening experience will depend on how much you liked the post 80's, 90's sound as I am going to call it. I don't think it is a massive problem but it can creep into your mind in a rather irritating way, more so on certain tracks rather than throughout.
After All (the dead)
Letters From Earth
Master of Insanity
Sins of the Father