Here are a few facts about Rondo's impact in Dallas I posted the other day in another thread.
Per 82games, which I used just because they are the easiest to sort through, particularly on a phone, Rondo has the following Drtg and Ortg:
Dallas Drtg on court (294 minutes): 96.8
Dallas Drtg off court (1453 minutes): 109.7
Dallas Ortg on court (294 minutes): 110.6
Dallas Ortg off Court (1453 minutes): 117.0
Drtg +/- (-12.8 )
Ortg +/- (-6.4)
Net +/- (+6.4)
The conclusion that can be drawn here is that Rondo has had a negative impact on the Mavs overall offensive efficiency. Without Rondo Dallas was playing at a other-worldly good efficiency on offense. But even with Rondo, they are still very good on offense.
However, when looking at the astounding impact Rondo has had on the Mavs defense, in which they went from being utterly terrible to one of the best defensive units in the league with Rondo on the court, it becomes evident the good more than outweighs the bad.
Bottom line is, Dallas is still a highly efficient offense with Rondo, bit is now also a very good defensive team with Rondo as well. Rondo has had a net impact of +6.4 points per 100 possessions, in terms of on/off numbers, when you consider both sides of the ball.