Seriously, people pulling out all these "intangibles" nonsense.... watch a game with him.
He bobbles every pass you give him. Blows open layups constantly. Too slow to defend even Gasol who abuses him regularly.
He does nothing to help the team offensively, and defensively he's still a wash with what Collison would bring at the same position.
Fact: Playing him helps the Grizzlies win.