Marry a person based on his character, not his religion. Many, many lapsed Mormons catch the true vision of the gospel at some time in their lives and desire to repent and become observant again. If everything she is taught is correct and the Mormon church is "true" she should be able to research any anti-Mormon books or movies and prove their criticisms are lies. It will only get worse.
It is how she is programmed and it is a fundamental tenant of the religion. However, he was often in a horrible mood after long shifts. You join the LDS Church. And as an outsider it will be obvious to you what's going on, but here's an awesome breakdown from a couple that flipped from "we go to church every week - we will write a Mormon blog" to resigning over the new policy banning children of gays all over the NY Times this month and something that is upsetting many staunch church members a few days ago. I'm afraid he's going to be more in love with work than me and a family.
There will always be difference between spouses. You have to be so strong to be on your own so much. But I was unusual in that I never really wanted to convert my husband I was worried I'd have to divorce him if he turned true Mormon and he didn't need me to believe way he does. She will be pressured and will likely shut you out. See her good qualities for what they are and see it as a good relationship to remember. I am also certain that there are callings and opportunities that I would have had, were I married to a faithful LDS woman, that I have missed. Dress nicely, as the girl will appreciate the effort put into looking good for her, and encourage her to do the same.
I'd suggest taking issue with things that specifically bug you the most. We have family prayer every day and read the scriptures occasionally. Most want nothing to do with the church. I'm sorry you may be hearing a lot of negativity from us.