Generally speaking, most of them are the same - very mediocre.
Jaws is very good. Boomer is a good studio guy.
Simms could be really good. He is really good if you hear him on radio during the week breaking down a game. In game, he just can't bring himself to criticize QBs no matter how bad they play and then he goes way over the top in praising them when they play well. It kills him as an analyst.
Kiper is fine at what he does. He's not a football analyst and doesn't appear on a football show. He's on once a year on a made for TV entertainment special. He is neither right or wrong more often than anyone else on those shows. He's just more visible with his ridiculous hair and more full of himself.
Faulk, Schlereth, both Sharpes, Dukes, Ian Eagle, hoge, and Solomon Wilcox are among the completely awful.