Giancarlo i don't think being the 9th or 10th greatest HW is an insult earlier, i was responding to sgwaue saying he was top 5 no doubt.
I've also always said Marciano was highly overrated too, i've actually said so on this site before. Rocky's biggest wins were against a washed up Louis,Walcott,Moore and Charles. He also should've lost the decision against Ronald La Starza, and was champ in probably the weakest ever HW division.
Fighters i think were definitely better than the both of them:
1.Ali 2.Louis 3.Holmes 4.Foreman 5.Holyfield 6.Liston 7.Lewis 8.Tyson 9.Jack Johnson
I also think arguments could me mad for Ezzard Charles and Floyd Patterson. The fighter i find really hard to rank is Jack Dempsey, because it's well know he avoided the top black fighters especially Sam Langford.