The documentary itself was very well made, showing little bias towards either the Evangelical or liberal sectors. Therefore it is definitely worth watching. As to the content, it was very informative, and I came out of the theater feeling that these kids' parents do truly want the best for their children, and feel they are giving them that.
That being said, the brainwashing that is occurring in these children across America frightened me more than The Exorcist ever could. At one point, the leader of the camp stated to a Christian radio host that what children learn in their early years determines 90% (or some large percentage--I forget the exact figure) of their beliefs in adulthood, and she gave that as the reason why she focuses on children. The radio host retorted that he sees a clear distinction between learning and indoctrination, which is what she is doing to these children at their ages.
I do think that she truly cares for these children and is doing what she feels is best for them and for her vision of the world. But her actions, in my opinion, are borderline terrorism. Her fundamentalism differs from that of terrorists' only in that she does not place grenades in the hands of her legions of children; she places them in their minds.