If a religion uses blackmail to keep you in (ie. your family will shun you), stifles discussion that could contradict with official policy, and makes people throw away the future based on the leaders theories (end is coming!), but then it doesn't, that is not healthy.
Mind you, as I type this I find it ironic because I could say the same things of the 1st C. Christians (The apostles kept saying the end is soon, you were not supposed to listen to those who preach that Jesus was not raised from the dead). At least it doesn't seem they shunned people when they left though...