The folks at LGM have started a list of the worst sportscasters, and have Paul Maguire, Dick Vitale, and Tony Kornheiser at the top of their list, and who can argue with that selection. Having said all that, I seriously doubt the merits of any list that does not include Joe Buck and that idiot Tim McCarver, Phil Simms, and Chris Collinsworth. I really have not watched more than an inning of the World Series in several years because Buck and McCarver are that bad, Phil Simms ruins every late CBS game and I never have any clue what he is talking about, and something about Chris Collinsworth makes me want to punch him. Every time I hear his voice I have an image of him sneering sarcastically.
Then again, I may have bad taste- I have always been a fan of Dan Dierdorf, and most everyone I know can not stand him. I also may be spoiled, as I was lucky enough to listen to Jack Fleming for a number of years.