I'm Mormon! Well, a recovering one.. and I think that the majority of us are pretty swell. Of course, with any religion you are going to have the judgmental, holier-than-though asshats. In general, Mormons believe in very similar things to other Christians. Love thy fellow man (no jokes please, haha..), try to be like Christ, etc.
Being raised in that church, going through seminary, and subsequently picking up a degree in religious studies (world religion & theology), I think I have a unique perspective on the good ol LDS church. It's no more or less nutty than any other church out there. It just seems strange because there are marked differences to mainstream Christianity. If you think they look weird, start reading up on the Hindu or Zoroastrian faith.
And - speaking from experience, most Mormon missionaries are NOT hot.
They do have a certain air of innocence and purity about them that most Mormons carry around.