Whether the Watchtower organization is efficient is debatable. I imagine they are efficient at pushing a button on a printing press, packing boxes and doing housekeeping on their facilities. This is evidence that they are God's organization??
Consider then how efficient they are in reaching people with an urgent life saving message! Their method is to send people to walk around ringing bells on doors that rarely open. How efficient is this? Compare this with how efficient other organizations are : Fedex, Apple, Nasa, etc etc which have to implement incredibly intricate methods to streamline R & D, production, deployment, support in a scale which is much larger. Surely these are true marvels of efficiency when compared to " Press button to print pamphlet, then pack boxes..." operations at the Watchtower organization.
If a mayor of a city needed to warn the citizens that the water supply was poisoned, do you think he could find a more efficient method to inform people other than ringing door bells??? If relying on people to calmly stroll around ringing door bells, is the best that the Creator of the entire universe can do, they we are in trouble...