I feel that the 20 year old Sullinger has a tremendous feel for the game of basketball, and that, along with his work ethic, is what's going to define his career.
He's a big body who can shoot, rebound, pass, finish at the rim, and seems to have the instincts to become a good team defender. What's not to like about what we've seen from Sully so far.
Once he figures out how to use his big body to post up, and figures out how to convert shots in the 3-9 foot range (28% this year), Sullinger could become a legit low post option.
All that said, if you could package Sullinger with someone like Green to bring in a Josh Smith or Handy Andy, you do it, especially in the case of Smith, who gives you a legitimate chance of a title this year and next, and also some long term stability when Pierce and K retire.
One thing I don't like about Varejao is his productivity goes down in the playoffs, when teams concentrate more on the little things, and play with higher energy than a regular season game.