Bibby +10 and Jamaal Crawford +9 have keyed the Hawks moderate success. Despite a great PER rating Horford has not had a great impact on their usccess [sic].It's true that Al Horford has poor adjusted plus/minus numbers this season. As do LeBron James and Dwyane Wade. It's also true that, over the entirety of this season plus last season, Horford's 15th in the league in adjusted plus/minus.
In defense of Horford's reputation, I'll offer some unadjusted plus/minus numbers from this season:
|Al Horford||Off Eff||Def Eff||Poss|
|w/ Josh Powell||102.0||124.1||202|
|w/o Josh Powell||108.9||103.4||1787|
Josh Powell has been on the court for 10.2% of the possessions Al Horford has played. Those possessions have decreased Horford's overall on-court offensive rating by 0.7 points per 100 possessions and increased Horford's overall on-court defensive rating by 2.1 points per 100 possessions.