One simple rule for the Church: Don’t criticize or complain about things you did not participate in.
For example, when someone comes out and says, “The worship music was lousy today,” they usually have no idea what truly happened. Someone had to pick out the songs, and another person found the music in the correct key for the singers. People had to practice, and who knows what their minds and heart are processing. Sound people are trying to get a good mix and relying on their ears and instincts. This is not to mention the pressure of a live performance in front of your peers. Quite literally, a thousand things could go wrong on any Sunday morning. It is much more complicated than it looks.
Your criticism might be valid, but there are numerous reasons for this result. Everyone did their best, and it didn’t go as planned.
Please don’t tell people how poorly they did their ministry when you do not even know what their job entails.