Well there have been opposing opinions about Scientology, so I would also as well as other views given below, give the web sites that can clarify this state of affairs.

Firstly, a site that explains why some people oppose L. Ron Hubbard's discoveries:
Dianetics and Scientology history

Opposing Scientology

The official Home Page takes you to a lot of material describing social betterment programs, helping mankind spiritually, community work and much more:

Scientology Official Site