Don't get me wrong - Ozzy's early stuff is legendary, including his albums with Rhoads. But man, he did not age well. And yes, to be fair no one, including Dio, could have sung those early Sabbath songs the way Ozzy did. Sabbath really had to change their music to accommodate Dio's vocal style, and I totally get how some people wouldn't like that.
Well, there goes my internet argument, haha.