Wes, between the "heavy boots of lead" and being "turned to steel in the grave magnetic field" (there's a rhyme for you, AC), Iron Man was even more ungainly than Ozzy himself.
Yeah, pair the heavy boots of lead with the line "can he walk at all, or if he moves will he fall?" and the one thing we know for sure about the narrative is that the Iron Man has some huge-ass feet, or some Frehley-style moonboots taken to the next level.
The issue of him being turned to steel in the great magnetic field is what gets me hung up on the robot/cyborg issue. We have to assume that he was made of flesh before the great magnetic field turned him to steel; I guess he could have been a rock monster or something, or made of electricity, but that seems like the kind of detail Sabbath wouldn't glossed over. So if you're flesh but get turned into steel/iron/lead, are you a robot now? Or is this some kind of shady cyborg deal, like how the Terminator was supposed to be a cyborg, even though he totally wasn't a cyborg, just a robot with some skin on top?
Christina, I do agree, as you suggest, that hubris is at the heart of "Iron Man". The most damning lyric in the whole song is "We'll just pass him there/Why should we even care?" I mean, come on, this guy travelled time for the future of mankind, and you just walk by and think "who cares about this jerk?" No wonder he had his vengeance from the grave, killing the people he once saved.