He was an elite level pressure fighter who would beat a fighter pretty much every time. Indeed, he only ever really lost in his prime to a blind counter punch from Marquez and a dodgy decision.
However, I personally never thought for a minute he'd beat Mayweather, because an elite boxer beats an elite fighter every time. His fight with Mayweather went exactly as I thought it would - in that regard, Pacquiao always looked beatable.
Pacquiao from the David Diaz fight til the 3rd fight with Juan Manuel Marquez looked unbeatable. He was punch perfect in every fight and made it looked easyp. Plus some of the size differences in the fighters he fought was madness, especially the Margarito fight. At that time frame from 2008-2012 he was destroying everyone in front of him. Diaz, De la Hoya, Hatton, Cotto, Margarito, Mosley and pretty sure he fought Josh Clottley around that time frame. He was destroying the lot of them, out boxing them. Not once in them fights did he look beatable.
It was a round that time when Mayweather wanted him to take blood tests and the knock outs stopped. I think once he beat Cotto the way he did, questions started getting asked.
Juan Manuel Marquez exposed him for not been able to deal with counter punchers. I remember the first fight, Pacquiao dropped him three times in the first round, JMM was shocked at the speed. Once he got to grips with him it was a close fight, it ended in a draw but I think Pacquiao nicked it by a round. The second fight was very close again, Pacquiao got the decision but could of went either way. The third fight between them, Marquez imo won that fight by about 5 rounds. He was countering all night, making Pacquiao miss, had Pacquiao in trouble couple of times. Such an underrated boxer was Marquez.
I always fancied Mayweather to beat him too! I always fancied Mayweather to beat him from when the fight got made. It went exactly the way I thought too. I knew Mayweathers boxing ability, IQ and his defence would he to much to take on. It was just a shame, it never happened between 2009-11.