Looking at whole body of work,
Vitale - not going to lie, i used to like him when I was in High School 20ish years ago... His problem is that he has the exact same act from 20 years ago. He looks (and sounds) pretty rough now, and needs to step away.
Nantz - perfect voice for taking a nap while watching golf. I think I now nod off whenever he starts to talk, just out of reflex. Love that man. I have had some really good naps thanks to him.
Finebaum - kind of a Clay Travis-lite to me. He plays to his primarily Bama audience, which including bashing UT, but was he really that wrong with any of his criticisms of UT over the past 10 years? He has actually talked up Tennessee a number of times recently. Is he kind of annoying? yea, but i would put others far ahead of him.
Corso - aka "football Vitale". Was entertaining like 20 years ago, but his shtick has gotten old. Nowadays, i just feel bad for him. Not sure his health has been the best, and it has been pretty obvious he isn't right over the past few years.
Fowler - Back when ESPN was actually about sports, i used to like watching him as I prepped for the day's slate of games. Not a fan of his poking at UT, and he does come off as kind of a smug jerk, but he isn't any more annoying than other play by play guys (Verne......).
Olberman - Used to like to watch him on Sportscenter, back when it was he, Berman, and Chris Myers (along with others). I actually thought he was one of the more witty ones before he left to do other things. I guess I do not watch enough ESPN any more to see why he would be annoying now.
Stephen A Smith - when you say such stupid stuff that even I know about it... and I only get my sports news from Volnation and my Google Feed of late, you are pretty bad. I don't even know what his "thing" is. He just seems to say ignorant/outlandish things to get people talking about what he has said... I have actually tried to watch clips of some of his "takes" and on most I get too annoyed to even finish it. I actually think that he is just a caricature created by ESPN, trying to play to an idea of what they think certain segments want to hear, while also getting those he offends worked up, and watching the next show to see what he says, so they can be mad about that too.