Dylan for his style is fine. He's actually more a Folk singer than Pop and one great song writter. Put him together singing with Jeff Lynne {from ELO}, George Harrison, Tom Petty, and Roy Orbison and he's absolutely fantastic :>} One of the best rock bands formed and never got the chance to tour. One album was cut with all them present then Roy died. The Traveling Wilbury's.
Now the absolutely worse pop singer ever second to none is Yoko Ono. Mortica on the Addams Family sang better LOL.
Did anyone other than Yoko ever really consider her a singer??? ha.
Ono! not Yoko. I guess I would have to agree with you on that one :>)