Wow... most of the grievances are around how they handle people who disagree with their teachings.
And I agree. My biggest complaint is that they are extremists in their dogmatism and I can't disagree openly. And by disagree, I don't mean outright calling them liars, but instead having rational conversations with family and friends. Doing so labels me spiritually weak and even apostate.
My next grievance is not being allow to quietly leave without being shunned in some fashion, up to and including expulsion.