Here's the thing with Sullinger. Might he never be more than a BBD/Bass type player? Maybe. But on this team for next year that's still something of value.
A lot of these so called experts seem to forget that Kendrick Perkins averaged 8-10 PPG here despite dribbling the ball before going up with it (and consequently getting rejected) half of the time. Playing with Rondo and the Hall of Famers is a pretty good gig.
And this certainly won't be a case of Giddens, Moiso, or Kedrick Brown again. All were super athletes with no basketball skills. Sullinger has post moves, can hit an open jumper and generally knows how to play the game.
And as others have suggested, for these reasons, he could end up being a Boozer/Brand type of player in the future if he continues to develop his game.
So while he may not be an All Star, I'm confident that at the very least he can be a solid rotation player, which at the very least can help us next year.