I'm not high on Smart either, but in defense of his summerleague performance... I remember Sully stinking it up as well. And it seems the Celtics might be a team that has their players work on their weaknesses during Summerleague play. I haven't watched many of the games, but I hear he isn't penetrating much... which supposedly is something he's pretty good at. If he's missing shots, it's understandable, because he's a bad shooter.
Should be a solid defender off the bench, though. He's top 5 in steals so far.