There are plenty. I am watching NFL network and cringe every time Javon Kearse opens his mouth. "The Freak" was clearly coined due to his skills in studio.
But the worst, week after week, is Michael Irvin. The guy is a disgrace. From his suit to his glasses to the nonsensical cr@p that comes out of his mouth. The guy has so much brain damage from coke and hits that he can't form a complete sentence that logically addresses the issue at hand. He is worse than a Ms. Universe contestant trying to give an answer to a question. Sure, Berman is Berman, Keyshawn is infuriating, Fox Sports has its morons, but Michael Irvin is the worst of the worst.
If we were drafting worst football announcers/analysts, I'd grab Irvin in the first round and never look back.