In the past 4-5 years, Christmas has been the time the city of Boston turned cold. All the Celtics' good starts stopped at Christimas. Witness the following records:
2008-09 started 27-2 (.931) finished 35-18 (.660)
2009-10 started 23-5 (.821) finished 27-27 (.500)
2010-11 started 23-4 (.852) finished 33-22 (.600)
2011-12 no game before Christmas finished 39-27 (.590)
So in summary, their performance with Christmas as their demarcation line:
Hot start: 73-11 (.869)
Cold finish: 134-94 (.588)
The .869 record, if translated to an 82-game schedule, would be historic: it's a 71-11 record. OTOH, the .588 record, if translated to an 82-game schedule, would only be 48-34.
This year, the start isn't that hot. Looking at their schedule, they will be staring at a very likely 14-12 record by Christmas. Take their .588 after-christmas percentage (which equates to 33-23 with 56 games left), you are looking at 47-35.
What would 47-35 land you? of course that's a playoff spot, i.e. a failure in Fierce's warped mind because that won't be a lottery pick ...