Hell, I could make a top 20 but my brain is failing me right now.
Those not yet mentioned:
College football alone:
Joe Schad (for the NBA-inclined, imagine Windhorst with ten times less cred)
Mark May (a mountain of reasons, but mostly he doesn't know shit)
Jesse Palmer (nobody is higher on Jesse Palmer's opinion than Jesse Palmer)
Brent Musburger (if your team is a perennial favorite, I don't even have to explain)
Paul Finebaum (if we can count him, has an SEC Penis permanently up his ass)
"editorialist hacks"
Skip Bayless (if you need this explained, you are probably a dick too)
Stephen A Smith (to a lesser extent, more his mannerisms than anything)
Dan Le Batard (know-nothing)
Michael Smith (know-nothing #2, but even worse)
that chick with Michael Smith...can't even think of her name. (know-even less)
NFL:
Merrill Hoge
Tedy Bruschi
Ron Jaworski
(these three aren't atrocious...I just feel like they say absolutely nothing every time they speak, even Jaws' XandO breakdowns are patently obvious)
anchors in general:
Trey Wingo (aside from Berman, nobody on all of ESPN likes the sound of his own voice better than Wingo)
Neil Everett (he's not funny but evidently nobody has told him that)
Stuart Scott (lack of self-awareness much? I even saw him doing analysis. He's the biggest dork that believes he's the exact opposite. He's still doing 'catch phrases' like it was 1994 and not 2014)
Special category unto himself:
Chris Berman. I literally can't (and won't) stand to watch/listen to him. Thank God the NFL Network covers the draft too.
Honorable mention:
Dick Vitale (I don't hate him, he seems likable enough as a person, but my god he's a worthless analyst. If it's not related to a half-dozen programs (or even less), he knows next to nothing)
I'm sure I'm forgetting a good 10 more.