Hopkins. Just because the rest have become severely underrated. Marciano is basically a bum now who beat nobody of substance. Roy Jones has supposedly been glass-jawed his entire career. Only Mayweather gets his due, even if he's ducked a fight or two. He's no doubt a great boxer and he is rated as such. Hopkins is the one who NEVER gets criticised for his losses, even if they came against the most skilled guys his own size that he faced. He also gets immense praise for his biggest victories, when most of them came against smaller guys fighting past their best weights. If he was the boxing master or god he is perceived as he should have been able to overcome a one-handed RJJ. Or do better against a slap happy Calzaghe than merely hold and spoil most of the fight. He should've easily beaten Jermain Taylor also, who is fairly limited. I think because he defied the laws of nature still being an elite fighter past the age of 40, people are inclined to give him the benefit on everything. Fair enough. But out of this lot he is the most overrated.
I voted Bernard, simply because the other 3 boxers get a lot of **** all the time, freeing them from being overrated. I think none of them are really overrated though.