The Cavs this season, according to bball ref, are 4 points per 100 possessions better than their opponent with Garland ON the court. That's good.
They are 7 points per 100 possessions better with him OFF the court.
Therein lies the issue when people just use net rating. Lots of players have positive net ratings when the team is really good. The question is, is the team even better when they are off the court? And the answer this season is, yes, they are.
Garland is a career 15 PER player. He's a 15 PER player this year.
He's being paid 40 million dollars. He has to be more than the above.