Alex Harvey was part of the soundtrack for my formative years: the local radio station played "Gang Bang" for its novelty/shock value, "Faith Healer" and several others. I pulled out the CD "Live on the Test" (from a BBC appearance) this past week and was surprised how well it holds up--his take on Jacques Brel's "Next" is brilliant.
I'm not into nostalgia (I can't imagine listening to Alice Cooper, only listened to the anniversary re-issue of "Dark Side of the Moon" once, generally hate classic rock radio) so I don't think Alex's appeal can be attributed to that factor.
Unfortunately, his CD's seem to be only imports, so they're somewhat expensive; fortunately, they've combined previous releases into Two-fers.