I think that people far too easily forget how little time that Avery has really gotten to properly improve.
He misses training camp after he's drafted because of an ankle injury, injuries to the Celtics during the season result in him being recalled from the D-league because we were literally running out of bodies to put on the floor, and then he misses an offseason chance AGAIN because of the lockout and the essentially non-existent preseason. Playing overseas is nothing compared to practicing with his NBA team.
Now that we actually have a healthy team, a reason to limit the load on the starters, and chances give the kid serious minutes, well blow me down, suddenly AB is steadily getting better before our eyes.