Name some upsets that you now consider overrated because the favorite was exposed as a one trick pony or just never showed any greatness after the loss. Calzaghe beating Lacy comes to mind. Calzaghe fans act like he climbed Mt. Everest in beating Lacy but Lacy hasn't proved to be anything other than a one dimensional brawler with an heavily promoted left hook. To be fair, I did favor Lacy to win and underestimated Calzaghe's skill but I still believe that it would be a matter of time before Lacy would be exposed by any good boxer.
Calzaghe beat seven other titlists, and he got Jones and Hopkins when he could. So fair play to a great fighter. Maybe Maidana and Broner, or Tszu and Judah. Holmes-Cooney.