To me what's most impressive of it all is that you can count on one hand the amount of rounds he lost against all of them combined.
First - Barrera, Morales, and Marquez are all LEAGUES better than any of the other guys you named, especially when Pac fought them. Second - Pacquiao's achievements are only considered amazing because he's moved up in weight. But however it was accomplished, he's a welterweight now, he and Floyd are in fact about the same size. He doesn't get a pass for fighting guys at convenient times just because he was smaller once upon a time. If Pac had fought Shane immediately after Shane destroyed Margarito, I'd give him credit for that fight, but he didn't. If he'd fought Cotto prior to Cotto catching a plaster-gloved beatdown, I'd give him more credit for that fight, but he didn't. Nevertheless, this is by far his best win above 130. And so on, and so on.. I've outlined it before.
that's where I am at, as well these guys act like he went in there at 112 pounds and shitkicked these fighters! Now he's about to fight his main rival at a weight the latter is preposterously unqualified to fight at and I'm sure that will get added to the resume (i.e. "well, the first two were close, but he showed who was the man in the rubber match") and everyone will say "Pac W12 Ray Leonard"
Ive come to respect Tszyu ALOT since he retired, BUT...... Manny would have beaten the ever living shit outta him. Tszyu was a great technician, with great power, but Manny has that extra something that Tszyu NEVER had..... and that extra something is WILL. No, I'm not saying Tszyu was heartless. But he sure as HELL did not posses the type of will and desire that Manny has. This fight would be a war, and Manny LOVES wars.... Tszyu does not. Tszyu would land his share of big right hands. He'd buzz, or even hurt Manny once or twice. Then Manny would recover, throw gloves in the air, and would give back twice as hard.... and that would break Tszyu's will. THAT coupled with Manny's handspeed, angles, and stamina..... and Tszyu is done around the 9th or 10th.