When I say OD is king, I mean that it is the most important skill in the game. There has been debate in the past few seasons on whether or not it is too powerful, but I digress :)
You want your Point Guards and Shooting Guards to have the most OD on your team. Next, your Small Forwards, then Power Forwards and Centers. As the saying goes, "Offense wins games, defense wins championships."
Here's an FYI: just because a player is listed as a Point Guard, for example, doesn't mean he has to play point guard. He could have the skill to play Shooting Guard.