Oh yeah, Sabbath has plenty of aggressive and energetic stuff, I just felt like shitting on that one song cuz everyone seems to consider it a classic (which I can kind of understand, but I still really dislike hearing the song). I mean, Disturbing the Priest is basically the Gorguts of trad metal with that weird angular harmonic-laden riff and the piercing vocals. They were unquestionably heavier than anyone else at their time.
Yeah, Living After Midnight was an obvious and successful attempt at radioplay. It isn't remotely representative of everything they had done up to that point.