Hagler beat some really good and great boxers. Monroe,Watts and Briscoe were outstanding contenders from Philly and Hagler beat them all. He beat Hearns,Minter and Sibbson . Hamasho while not skilled in the traditional sense was still a task and Hagler beat him twice. Mugabi was an unbeaten power puncher and Hagler took his heart. Monzon is a very sublime boxer in where you dont notice alot of what hes doing because its isnt flashy or eye catching. Hes the type of boxer in were if you watch him closer THEN you realize what hes doing and appericate how great he was.
the end result is the same. face it, some fighters are just better and frankly, I have no idea what kind of game plan team Monzon would come up with other than "we're counting on Hagler to freeze up" against ice cold Monzon who I hear hangs out with Galindez like a couple of bad azzes! this isnt slow footed, low intel defense Bennie Briscoe we're talking about who failed 3X in title shots its Monzon's left paw vs hagler's head snapping jab and yes, Hagler will catch and hurt Monzon with it plus, Monzon has no inside game! in all the discussions we've had you have not once acknowledged this. the entire strength of your argument seems to be "Monzon is mentally stronger than Hagler who will crumble mentally once he realizes who he's in with" such things do not happen in the ring with the more reputable fighters. In short, psych outs work only on losers, not legends
Duran was not even close to being a great middleweight, beating him at lightweight or welterweight is a good feat but not at middleweight.
Anyway, I would say that competition wise they are pretty close. Neither had really exceptional competition but Monzon pretty comprehensively beat everyone he faced.
Beating Duran at 160 is indeed "a good feat". While it isn't a "great" feat It's better than a good feat imo.