I say the only man at 168 who gives him bother is Calzaghe.
IMO he goes straight through Kessler (Come on Kess lovers,who has he actually fought to be regarded so highly...that may even go for Joe too) and the rest and is clearly the dangerman of the division.
I know a good few members who are now starting to sit up and admire this guy's abitlity.
http://news.bbc.co.uk/sport1/hi/boxing/6509671.stm