Margaret, the problems I had with the Organization were the changeability of "truth", and the fact that every other religious group has been castigated by the Society for being imperfect and not living up to their high ideals.
Additionally, one is encouraged to closely examine their faith.....until one becomes a JW....then any examination is strongly discouraged.
The major problem I found is in trying to correlate the scripture which says that you will distinguish true Christians by the "love they have amongst themselves". This true Christian love was sorely lacking in every congregation I attended. Instead of love, there were divisions, cliques, favoritism.....the list goes on and on. Eventually, I could no longer reconcile the reality of the Organization with the biblical precedent for the true religion.