One thing I have noticed, especially in smaller churches, is that the need for leaders is so great that often anyone who can fog a mirror is qualified. That can be a very serious mistake. I have seen the results on church boards and councils where the only qualification was willingness to serve. Even though the intent might be good, the long-term result won't be.

And I think that is why Paul is laying out these qualification. Leaders are expected to have a track record in which they have demonstrated not only their faithfulness but their behaviour. No one can be "above reproach" without having a consistent witness. "Faithful to his wife" isn't something that is visible on return from the honeymoon. Temperate - Self-controlled - Respectable - you get the idea. These attributes are demonstrated over time.