Actually, all the advanced stats, all the reports I've read, and the few times I've seen him play this year--they all point to a player who is much improved this year on the defensive end. His pick and roll awareness is much better. He's more alert and focused on that end. He's always been a very strong defensive rebounder, and he's got good offensive skills.
Vooch is definitely a guy I'd love to see on the Celtics.