As a Mormon, I've never encountered any such pressure to "appear financially successful." This is a nonsense statement made from someone who doesn't know much of anything about the LDS Church. In fact, the messaging from the church leadership is just the opposite--live within your means and stay out of debt. This is a consistent, constant message. I can promise you the claim that we're pressured to "look successful" is laughably false and the polar opposite from the truth.
On the other hand I would agree that people who marry young and think they need a house beyond their means is likely a cause of mortgage problems in Utah. People in such a situation should rent until they're able to afford a home of their own. But there's nothing in anything the church teaches that should make them think they need to own a home. That's their own internal misjudgment.
But let's face it, the problem of people living outside their ability to support it is a national problem, not just a Mormon problem, and at the crux of the national foreclosure crisis. Other states like California, Arizona, Nevada, Michigan and Florida have had much more of a foreclosure problem then Utah. I think the need to connect this issue to religious practice is gratuitous. There's really little connection between the two. And if one really wanted to build a silly argument upon a silly arugment you could say that not being a Mormon was a bigger cause of foreclosure than being once since the states with the highest foreclosures are not predominantly Mormon--just like within Utah non-Mormons are those with the highest foreclosure rates. But again, this is an absurdity just like the initial premise.
I believe you. But, you're probably aware that this is a common narrative peddled by the media with respect to your religion, amongst other rumors and innuendo as well.
I sympathize. As a Catholic, I'm frequently frustrated by some the same fallacies, and slanderous accusations perpetrated by the media against my church. Unless you worship at the altar of "big government", the media has no use for you.