All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the servant of God may be thoroughly equipped for every good work.
2Timothy 3:16-17
The reason that preachers prepare sermons every week is not to make people feel good, but so that the gospel might be preached and church goers may be equipped to do what God wants them to. It is not a motivational talk, not a monologue that people should crit in terms of delivery but an opportunity to learn how to serve God better.