Don't you even start there bud, we both know that Brian can actually sing, and what we have here is him giving the ACDC overdriven vocal treatment to an even older classic standard. You look me in the eye and tell me that's not hamming it up for the crowd (it's what he wants; I am still trying to decide whether the song choice is dramatic irony, or intentional piss taking).
I begrudge them not; just sayin.