The ridiculously high standards Floyd set for himself through his performances against top 10 opposition for 15 years, makes it impossible for fans to actually sit down and think "Wait a minute, this is actually a good opponent".
What people don't realize is that. it's not that they don't think Floyd's opponents are good, it's that they don't think the match is good, because of how good Floyd is.
It's like Roy Jones fighting guys like McCallum, Gonzalez, Hill, R. Johnson, Harding, Sosa, Del Valle, Griffin etc These guys were VERY good, really good fighters. Unfortunately you see NOBODY, or very few "Boxing fans" actually mention these fighters as good wins for Roy Jones Jr. Even his wins over Hopkins and Toney have some excuses behind it.
This is exactly what is happening to Floyd. His opposition would be seen as ATG-career-creating-wins for any other fighter, as seen by Pacquiao beating DLH, Hatton, Marquez, and Cotto and getting massive amounts of praise for it but Floyd fought old, shot, and small fighters.