Dylan just cannot fucking sing. Anyone who thinks he is anything other than a tuneless whining hippy has no ears. And considering it's the bedrock of his reputation, he's not even that good a songwriter. You have to wade through acres of rubble to get to the gems.
Zep are the originators of everything that ever went wrong with rock music. Girly hair, self-indulgent ballads, cucumbers down pants, endless noodly solos, and shit songs.
Based on the evidence above I'd say one of your other favourites is Neil Young.
Wasn't thinking of Neil Young, but I do really like him. Guess again?
Wasn't thinking of Neil Young, but I do really like him. Guess again?