The man has all-time great boxing skills, in my opinion, and he didn't use them against the top competition of the last few years (Cotto, Margarito, Mosley, etc.). I think he could've done very well against the top fighters but he just didn't. There's still some time left in his career, but I think he missed the better competition.
Sure, he'll be remembered as a great fighter who had amazing boxing skills, but he could've done so much more.