I don't have the same expectations for every player that just wouldn't be fair.... I wouldn't give a player like Jrue Holiday the Expectations of Dwight Howard or Kobe Bryant... I wouldn't give Danny Green the same expectations of Dwayne Wade either
I based my grades on what was expected from them and what role they were given. If a player exceeds their expectations I give them a higher grade... If they don't meet their expectations I give them a lower grade...
Okay, and there's nobody on this site who had higher expectations for Darius Morris than you did, so that actually makes me question it even more. Per 36, he produced 10/3/4, which makes him probably the 10th-best offensive player on the team...and most all players NEVER sustain their play for 36 minutes, so that's being extremely generous. He also shot under 39%, despite a lot of open opportunities he decided to brick, and he was horrible getting to the rim and finishing.
Defensively, he was okay...compared to Nash and Duhon. We valued what he did on the defensive end only because we desperately needed it, at one point. But compared to other backup PG's, he wasn't significant on that end, either.