I just read this article by Neil Cole:
The Threat of Heresy in the Organic Church by Neil Cole | CMA Resources, and I think there is a considerable amount of truth to it. I know of several churches being run by power-hungry pastors in an almost cult-like fashion. When all the leadership authority is given to one person it becomes easy for heretical teaching to enter the church, even if the leader's intentions are good. It seems a properly equipped church (regardless of size or model) will possess a body that is active in its pursuit of scripture as individuals, with a minimum of two seasoned elders providing leadership and guidance.