This is my families favorite ski destination and we ski at all Utah resorts. It is expensive but an amazing ski experience. The advanced skier can find some great terrain as well but I feel like DV can't be beat for family skiing. Small crowds and short lift lines. Some of the best ski instructors with a great ski school. Most of the main runs are beautifully groomed and there are plenty of tree and ungroomed terrain. In a low snow year it can struggle more than the higher resorts (like Snowbird). The staff are generally quite friendly.
The food is special .... relative to most resorts- try the skiers buffet at the Montage and you'll be a fan favorite with your group. There are made to order options as well.