Post his stats for me and explain to me why he is so bad because the fact that no one thinks he is consistent enough for you guys.
Your wish is my command. His per game numbers:
16.9 points /1.7 assists / 4.6 rebounds / 0.6 blocks / 0.7 steals
41.2% FG / 34.1% 3P / 79.5% free throws
Now, let's compare those numbers with a league average small forward (positional average numbers are available via the Box Score Geeks website; they post numbers per 48 minutes, I am adjusting that down to per 36 minutes to better align with how many minutes Jeff Green plays in a game):
14.2 points / 2.5 assists / 5.6 rebounds / 0.5 blocks / 1.2 steals
43.7% FG / 35.7% 3P / 77.7% free throws
So, at absolute best you could call Jeff Green a league average small forward. In actuality, though, he is a below average player. He is below average almost across the board; although he scores a couple more points it is on less efficient shooting, and his advantage in free throw shooting is negligible.
The numbers are pretty clear on this count. Jeff Green is not a very good player.