In terms of offensive rebounding, I think blaming the system might be a little bit of an excuse given by the team to justify the poor performance.
2008: 26.6% ORB%; 17th in NBA; -0.1% from league average
2009: 27.9% ORB%; 7th in NBA; +1.2% from league average
2010: 22.8% ORB%; 28th in NBA; -3.5% from league average
2011: 21.1% ORB%; 30th in NBA; -5.3% from league average
2012: 19.7% ORB; 30th in NBA; -7.3% from league average
In the first two years of the "big three" era, we were a respectable, or even good, offensive rebounding team. Our defense was also elite both years. Blaming the defense and the defensive philosophy for the lack of rebounding, then, is seemingly nothing but an excuse.
Our offensive rebounding right now is horrific. We're now getting second chances approximately 8% less than we did previously. That amounts to a significant number of offensive points that we're giving away through our lack of rebounding.
So what?
For the last 5 seasons Boston has averaged a 26th place in offensive rebounding.
For the last 5 seasons on average 7 playoff teams have been above the median and 9 below the median in offensive rebounding.
2 of 5 championship teams have been in in the top 10 in offensive rebounding(Lakers twice). 3 of the 5 championship teams have been in the bottom 10 in the league in offensive rebounding (Cs, Mavs, Heat).
All 4 finalists in 2012 were in the bottom 10 in offensive rebounding.
IOW, offensive rebounding stats are very overrated compared to something like effective defensive FG% where the championship teams are almost always in the top 10 and have been for the last 5 seasons.
This^
ORBs are nice when you get them, but having high ORB numbers simply doesn't correlate with winning.
Doc has explicitely stated that they are almost indifferent to ORBs as a matter of strategy. Its not an excuse. Its a reality.
And, frankly, its hard to argue with the results. The C's have been among the elite defenses every year and have gone deep in the playoffs almost every year.
I would love to see them be even better on defensive rebounding. But statistically, they were average last year at that. And there is not a lot more blood to draw from that stone: If they had posted the top DRB% of the league last year (Spurs, 76%) that would have amounted to 1.5 rebounds per game over what they grabbed. Essentially that's in the noise of random chance for a game.
So while I would welcome improved rebounding, it just isn't something to stress about.
I would like to see more post scoring on offense. That would pump up our offensive FG% (by taking more shots at rim and fewer jump shots) and have a much bigger impact on winning.
Hopefully the addition of guys like Wilcox and Sully will help with that.