I still have to say the worst one i've seen live is CFCN's Tammy Christopher. She is horrible and thats not because she's a woman because there are alot of great woman sportscasters out there.
She used to make at least 2 to 3 mistakes a nite. I used to watch it just to see how many times she screwed up.
2nd worse is that Jamey Campbell guy on sportsnet. He annoys the hell out of his mother.
goodness i'm bitter today. ehhehehe