Mommyoftwo,
When asking the parents who have their children in any particular school what they think of that school, it is important to make sure to focus on asking those parents who have children presently in the younger grades. If you ask parents of children in the older grades or who recently graduated for their opinion, the reports you receive may be based on their experiences from a long time ago which occurred when other people were running the school. It would be as if you are asking about a school which no longer exists.
Hatzlocha