I'm all for giving folks ammo for a lively songwriting discussion.
But if that contention was true, I don't think anyone would have given anything past, maybe, the first Dylan album much of a listen.
i came in from the other end. first time i heard dylan, it was greatest hits 2, i thought it was horrible and he couldn't sing, so i didn't listen much to the first two songs, but then lay lady lay came on, and i thought "not only does this guy suck, but he actually has someone else singing on his own greatest hits album". but i liked the new voice, at least compared to the old, and figured out it was the same guy, and started listening more carefully. of course, my mind was blown pretty quick after that. now i can't get enough of his voice, and probably spin his cover albums as much as his self-penned ones.