I used to be one of those guys that couldn't stomach Joe but after that impressive win over Kessler he really gained my respect and I finally feel that he is the real deal (he probably always was but his opposition was just so bad).
However, for me, he started fighting quality opposition far too late in his career to be considered P4P..he started at the tail end of his career and that makes it so difficult to judge how he would have fared prime for prime against somebody. The only fight we can do that with in his career is the one against Kessler and that was impressive. He just needs/needed more of those fights for me.