Pavlik does what he does very well. Beats guys up when they are infront of him, cornered, or on the ropes. The angles he throws punches from are limited though and so are the variety of punches he throws.

Movement is his kryptonite, I don't see him beating Calzaghe for that reason alone.
and to follow up on something a previous poster said - I think Spinks was robbed against JT.
I thought he made JT look like a complete idiot.