I just heard this on ESPN radio and it sums it up good.
Celtics play only one player taller the 6'8, but don't play with speed that spreads out the defense.
Small and slow.
The worst of both worlds. Doc doesn't want to go big (I have a feeling Darko would STILL be riding the pine if he was here), but he doesn't seem to be pushing guys to run, either. We're not taking advantage of our strengths, and we're offering up our weaknesses for opponents to exploit.
I think this is a direct result of the lack of defense and rebounding. They tried running earlier in the season, but were getting killed on the boards, because the guys underneath were not able to get the rebounds themselves, when the other guys were leaking out. So, to remedy that, they have stopped leaking guys out, and committed the whole team to rebounding, and it has taken away the fast break.
Unfortunately, there is not a very good solution to this, other than better defensive execution in general. If they can get guys rotating properly, then they will be in position to rebound, and still allow guys to leak out. But they are a long way off from that.