This is a very important thing to remember. Especially with so much talk in the Coffee Room about the topic of shidduchim.
To me there are only a few real red flags. How does the father treat the mother and vice versa? How do they treat their children? Do people in their community have MANY positive things to say about them or are they keep-to-themselves types? How does the young man or woman in question act towards wait staff in a restaurant, or to tradespeople, store clerks,etc? How do they act around little children? These are important questions to seek out the answers – not which summer camp they went to, or whether or not a seminary was too “modern.”