Just picked this summary up
"Some of the key criticisms that have been raised about the Jehovah's Witness organization include:
Strict control and authoritarianism: The organization is highly centralized, with major decisions being made by the Governing Body. There are concerns about the lack of democratic processes and the expectation of unquestioning obedience from members.
Shunning practices: The organization encourages strict shunning of former members or those who disagree with its teachings. This can lead to the separation of families and social isolation of those who leave the faith.
Suppression of free thought and questioning: There are concerns that the organization discourages critical thinking and the questioning of its teachings, creating an environment that is not conducive to independent inquiry.
Treatment of child abuse cases: The organization has been criticized for its handling of child abuse allegations, including allegations of cover-ups and failing to report abuse to authorities.
Doctrinal changes and failed prophecies: The organization has made significant changes to its doctrines over time, which has led some to question the reliability and authority of its teachings. There have also been instances of failed predictions about the end of the world.
Restrictions on medical treatment: The organization's stance against blood transfusions has been a source of controversy, as it has been seen as putting the lives of Jehovah's Witnesses at risk.
Top Reasons not to join Jehovah's Witnesses. Note the overlap.