IMHO, at HC MM never had a killer instinct. Here is the Globe's Himmelsbach's grading of MM in the summer league:
"Malcolm Miller: B
Miller was in training camp with the Celtics last season before reporting to the team’s D-League affiliate, the Maine Red Claws, and his familiarity with Boston’s system was obvious. Miller shined in Utah, including a 14-point opener against the 76ers, before cooling a bit in Las Vegas. Still, look for him to draw interest from European clubs this summer."