He's only recently just now retired. A lot of people are suffering from recency bias when the KO's dried up and he was no longer throwing a million power shots a fight and walking through people with a busted ear drum and chewing up HOF'ers and ATGs with an unyielding come forward style. In his prime I never once saw Pacquiao yield. Even against some massive punchers with precision and accuracy. Even against guys much bigger and stronger. Not once did he yield ground or the fight. Perhaps the only time I saw it was when Margarito hurt him bad to the body and he backpedaled (but he was twice Manny's size), but Pacquiao recovered that same round to viciously bang Margarito to the head with an overhand left. He's a special fighter. I think in 10-20 years his standing in boxing history will only rise.
Think I see just as many people claim he is the p4p GOAT as I see people **** on him. Both extremes indicating an incredible lack of brain cells.
Pound for pound is a strange and weird concept. But if you are going to use it, then it's virtually impossible to say he's not the best p4p fighter since at least Ray Leonard, if not Roberto Duran. Nobody is saying Pacquiao is H2H the best ever or even close to the best H2H of his generation. That would be Wladimir Klitschko. If you are using p4p appropriatley, well then, you have the lineal Flyweight champion who beat Marco Antonio Barrera and Juan Manuel Marquez in their prime. And then viciously destroyed Hatton, Cotto and Margarito in or near their prime. Argument is over. Period. The end.
I think he's clearly below Roberto Duran p4p. Pacquiao didn't beat Ray Leonard, that was Duran who did. But for everybody else post Duran??? Yea he stacks up favorably.
He's a legend. Just that he lost the "biggest" fight in boxing history after over half a decade of his fanbase going full-rabies over how everyone needs to wank to him no less than 8 times a week.
Maybe you should give training staff and coach credit for what a fighter becomes. Pacquiao was very unidimentional ealier in his career and got polished to eventually become one of the shiniest style in boxing and one of the greatests. All pro fighters are potentially great, only some get more chances than others.