I've read almost all of their various books of scripture, and I know what they believe.
I could care less about their theology and doctrines...all I know is that I have met a lot of them over the years, gone to school with them, etc., and I have yet to meet any Mormons who aren't upright, square, and clean living people.
Most of them "look" clean and fresh because they are forbidden the drinking of colas, coffee, tea; are forbidden to smoke or use illegal drugs.