Mohrb, I am an active JW. I know a brother that has the same take as you, that more people should offer constructive criticism in the form of letters to the Society. I am not of that opinion. Why? Because letters have ALREADY been written ad nauseum about some of the doctrinal issues I have an issue with. Proof of that is that some of these have found they way into Questions From Readers. It just tells me that the Society does not really listen all that well to constructive criticism. And, since they have a bad habit of returning letters to the body of elders, it simply makes the whole process uninviting.
I have personally come to the conclusion offered by Ecclesiastes 1:15: "What is crooked cannot be made straight and what is lacking cannot possibly be counted."