DRtg is pts/100 possessions. Rockets are ranked 22nd in eFG% http://www.basketball-reference.com/leagues/NBA_2012.html They were ranked 21st in eFG% last season. http://www.basketball-reference.com/leagues/NBA_2011.html The defensive efficiency is pretty much the same as last season. edit: I looked at the wrong column. Should be: 2010-11 Defensive eFG% 15th; DRtg 20th 2011-12 Defensive eFG% 21st; DRtg 19th We have actually regressed in the eFG% category. (The league average has dropped from .498 to .483)
