Robert Curre submitted a really good post titled "fixing the defense". Unlike Robert, I have no coaching experience and so I do not presume to argue with him about the technical aspects of the game.
However, let me open this for discussion. Does the extra effort expended by certain players on defense become a net zero? Take 2 scoring machines like Amare and Melo. If they expend 10% more effort on defense, does that result in a net positive or a corresponding 10% reduction in offensive eficiency. If Amare and Melo have to scramble like rabbits on defense, I don't think it's a net positive. However, I would like to hear from Robert and others on this.