Why are there so many explanations for Jeff Green's mediocrity in the 40 or so games he played with the Celtics?
Can you quantify what you are calling mediocrity? Because Danny had some good #s to show that Green was one of the more efficient offensive players on the team, using Points per possession for one. He also indicated that he scored more off the bench than any other bench player in the Big 3 era. Not sure what you were expecting but anyone playing 20 minutes or less a game is not going to put up eye popping raw numbers.
This article will give you all the mediocrity you need:
http://sports.yahoo.com/nba/blog/ball_dont_lie/post/Let-8217-s-not-go-over-the-top-here-Danny-Ain?urn=nba-wp3279A few excerpts: "Green had a turnover rate of 16.5, which means that in all the possessions he used up (possessions that ended with him doing something tangible on a box score level, like taking a shot, getting to the line, creating an assist, or turning the ball over), he turned it over on 16.5 percent of those chances. Now, that wouldn't rank amongst the league's worst for stone-handed big men, but it's not far off. And amongst wings and/or perimeter players? That's pretty terrible."
"He earned a subpar 12.9 PER for both Oklahoma City and Boston during the regular season, and managed a barely-rotation-worthy PER of 10 during the playoffs. Even when you hit 44 percent of your threes, that isn't good."