What I've seen rarely this season, even in spurts, is that insane, smothering D that made the `08 team special. Even when the Celts are building big leads (prior to blowing them) this season, they're doing it through dazzling Rondo-riffic offense, not killer D.
If there is indeed an "on/off" switch, I'd like to see a little bit of the "on" switch with the D.