The players are the only ones who take the court, so they are mainly to blame. But the coaches certainly share some of the responsibility.
Dudes need to stop jacking up shots as soon as the rock hits them and they have a glimmer of the rim. Ball movement will lead to better looks and thus greater consistency.
The turnovers are hurting, especially the ones from Amare because he decided to bulldoze muhfuhs instead of passing to an open shooter. It's almost like he doesn't trust any of them to hit the J.
The lame outside shooting from Gallo is certainly to blame. When he hits them at 45%+ we will be a juggernaut (e.g., the game he scored 24 last week). Without his shooting, Amare has no room to work and just becomes a turnover machine.
The bad P&R passing is to blame. Felton is not enough of a scoring threat so guys don't go hard at him to stop his shot. As a result, he has a slimmer passing slot to hit the cutting big. Makes ya sorta wonder how much of Amare's success was predicated on Nash's exquisite passing. Can we please trade Chandler for Rubio this season. Come on already.
The coaches also need to do a better job. Need to use timeouts when momentum has swung too far to the other side. Need to put guys in better position to score. Defense has been pretty good, which is a pleasant surprise from the coaching. There needs to be guys boxing out and grabbing boards.
All in all, though, they're playing okay for a group that just came together.