As a Jeff Green fan, you didn't want to do this to yourself.
The only benefit to Jeff Green is that with his size, he can really get up and guard the LeBrons and Carmelos when Pierce is out (even though he usually just picks up some quick fouls)
Other than that, he's an awful offensive player who can't go strong to the hoop and his post defense is terrible to where you can't use him at the 4 ; only the 3. Oh, and not a good decision maker.
Good guy to have with the second unit as long as you have a couple legitimate scorers next to him
I think you are overstating the case a bit. Yes, he is not an elite offensive player, but he is above average. He is a very solid shooter, he can finish in the paint, and he has even shown the ability to create his own shot at times (although he is not great at it).
I am certainly concerned about his rebounding and decision-making though. In college, he was always sold as an intelligent and tough player, and while he is no Tony Allen in the brains department, he has made way too many dumb mistakes since joining the C's.
I still have hope that after a training camp with the team, he will improve in these areas, simply by being more comfortable, and not over-thinking things, which will hopefully also allow him to be more aggressive. But, until he actually does it, it is just hope.