I wasn't familiar with the Dio-era Sabbath albums until very recently, although I was familiar with the radio 'hits'. I was less compelled to investigate this (brief) period in the band's history, because I have never much cared for Dio's fantasy themes, even though I love his voice (and his persona). As it turns out, H&H and MR are very strong albums indeed - having Dio in the band seemed to give Iommi and Butler a shot in the arm: it effectively became a 'new' band and although it is a little strange to hear Dio singing Sabbath classics on the live albums included in the Deluxe Editions, he does an excellent job, to my ears. This version of the band was probably destined to be short-lived, as Dio had very strong views on the direction it should take and he was by no means outranked by the others - he arrived in the band a star in his own right, whose profile was bigger than that of the others in 1979/80. As such a clean break was made with the past when Dio was recruited, I think it would have made sense to ditch the Sabbath name and effectively make it a new band - this idea seems to have been mooted at the time, but presumably Sabbath was still felt to be too strong as a brand name to drop? How are the Dio-era albums currently rated by Sabbath fans, I wonder?