The restaurant situation is pretty decent. Nothing super high-end but there's a market for a solid variety of different styles. That variety largely dissipates the further north or south you go from Salt Lake.
The valley has a smog problem. It's an inversion that waxes and wanes with the seasons and weather patterns. Some days it's unnoticeable. Some days it's a visible film you can observe from a high enough vantage point.
Rush hour traffic kinda blows. It's not like DC-level bad but it's worse than a lot of places. I was lucky enough to live near the TRAX (light rail) line when I was needing to commute up the valley every day but, even with it expanding in the past few years, it's not an easy option for everyone.
I've heard from people, both Mormon and not, that they like Utah for raising their kid, but I don't have kids myself so I don't have first-hand experience with it. Crime rates are pretty low and education costs are comparatively decent. Utah tends to rank at the top or bottom of lists of "where to raise your kid". They're at the top when it comes to things that involve the child like general quality of life for the kid. They're at the bottom when it comes to things that involve the parents like maternity leave and job support for daycare.
