Obviously the defense has been bad, but Brad's Celtics teams always get better as the year goes along.
Due to injuries, the Celtics are playing a lot more young/inexperienced guys than they did last year. That's really hurting the defense. We are going to need defensive improvements from some of the young guys since they are seeing so much time.
Right now, you can't count on Zeller, Rozier, Brown, Amir or Jerebko to be where they are supposed to be on defense.