He's got a lot of attributes - speed, chin and adaptability to name a few. I'd say his best attribute is his grit and determination as displayed against Byron Mitchell and last night standing up to dirty bully boy BHop.
Adaptability If you rely soley on speed/chin you can become very beatable as you get older and deteriorate, as Joe is now Adaptability is something that keeps you competetive no matter what, Hopkins is a prime example of that
Determination. He is possibly the fastest and most energetic boxer in the world today, but when that lets him down (hardly ever) like last night, his determination kicks in and drags him to victory. If he can still win with a referee like Cortez in the ring he's got to be special.
2006 outslugged the slugger -lacy 2006 outbrawled the brawler= bika 2007outboxed the boxer -kessler 2008-outhustled the spoiler-hopkins been in with every kind of style and found a way to win.
Adaptability, without that Calzaghe losses to Kessler who struggled with at the beginning, and losses to Hopkins who he struggled with at the beginning.