Dio was never in Deep Purple, Ian Gillan was. Dio was in Rainbow and ELF before that. Sounds like you're a little confused.
Also Black Sabbath were known for having some sloppy shows back in the 70's due to drugs, alcohol and Tony Iommi's old Gibson SG going horribly out of tune. I'd like you to click the link in post 26 called Falling off the Edge of the World and tell me that they suck or are boring. Please. I have some tasty crow for you to eat. I'm waiting.
But I never said Sabbath as a band was boring. I said the show we saw was boring and that Yes blew them off the stage. Don't get all defensive. Personally, I didn't like Iommi as a guitarist, and thought their drummer was extremely straightforward and uninventive. The concept about "devil music," "underworld," etc. was what was novel at first and that's what made their first album so appealing. But it got old very quickly. So, no, I didn't bother to follow them after the first album or two (if there was a second---can't remember).
As for "Falling off the Edge of the World," doesn't do anything for me. I like the guy's drum set, but the music doesn't grab me at all. It's, well, . . . boring.