average to poor on the ball defender
Above average to great on-ball defender.
As a Wizards fan, I'll tell you it was a myth that he was just some kind of a gambler. He was our only good defensive player, really. Most of his steals weren't off gambling anyhow.......he'd deflect or outright steal entry passes or strip guys in the lane.
Even as a fan of his though, I can understand the criticism. He's inconsistent shooting and he takes horrible shots.