Can't really think of anybody. Most fighters seem to get rated fairly, imo. Now and then some fans will overrate their favourites but that's natural and then you get others who will deliberately underrate said fighters as a reactionary counterbalance.
Dempsey Marciano Liston Roy Jones Jr is UNDERRATED. He's the best of all time and don't buy into anyones overly speculative drivel when they see person x, y or z will beat him. GTFO.
The best of all time don't end up as punchbags for journeymen, no matter how old they are. Jones did. End of claim, the T.B.E.:yep
Never said they werent amongst the greatest heavies of all time. But I think the guys I listed are overrated on two levels: head to head against later heavyweights and especially on "all time greatest" lists compared to non-heavyweights.
Cautious Play Roid Jones Jr. Ray Leonard also overrated: Aaron Pryor as was mentioned b4 me. Floyd Mayweather Jr. William Dempsey Wolodimir Klitschko Sohla Saenghom Bob Foster Ricardo Lopez Carlos Zarate