I spent a good percentage of time reading about Scientology at Wikipedia today. After clicking around a bit, I was led to a documentary-style film critical of L. Ron Hubbard and his Church. From Wikipedia:

The Friend of Mankind (2006) is a 30-minute essay film by Karl-Rainer Blumenthal about the accomplishments, controversies and followers of L. Ron Hubbard, founder of the Church of Scientology, composed primarily of American, English and German television broadcasts from the last 37 years.

If you've got 30 minutes, and have an interest in this sort of thing, I recommend checking out 'The Friend of Mankind'. You can view the entire film online at no cost here.