"Filled With Fear" is pretty damn ridiculous, one of their funnier songs in my opinion. It fit the Halloween theme.
What a riff: deedle dee - BWLACH!!! - deedle dee - dikidiki!
As for the 70's Iron Butt albums, the title track from "Scorching Beauty" is pretty good, but most of the rest is as hackish as you've heard. (And I'm pretty sure it's even got a Mellotron on it . . . )