Is James Harden the worst defender in the NBA? He simply doesn't give any effort on the defensive end, it's embarrassing and he needs to be held accountable.
Yes he is probably the worst Worse than KMart who at least tries as opposed to Harden who stands there watching
He ranks #88 in defensive win shares, above guys like Serge Ibaka: http://www.basketball-reference.com/leagues/NBA_2014_advanced.html