A rough, unscientific rule of thumb I have used in running churches over the past 30 years has been the distinction between sources of satisfaction and sources of dissatisfaction. That is, the things that make people happy and pleased to be here and the things that tick them off. Fairly early, the penny dropped for me that they are not usually that same thing. If you remove the sources of dissatisfaction you won't make people any more satisfied.
In a church, the things that make people dissatisfied are things like heaters that don't work or a buzz in the sound system; or the Vicar's annoyingly drony voice or the fact that whoever chooses the hymns around here has the taste of a blowfly maggot. Sources of dissatisfaction are easily identified - people let you know about them early and often. Sources of satisfaction are harder to idenify. They are more subtle, deeper and often unconscious. People don't talk about them much and tend to take them for granted. They are things like a strong sense of community, awareness of the presence of God, the knowledge that people are valued and accepted in this place.
Many clergy I know operate on the squeaky wheel principle. They spend their lives chasing around after the sorts of trivia that people ring them about, getting tired and wondering why the roll keeps on dropping. Of course if there is a buzz in the sound system it needs to be fixed, and perhaps I could do with elocution lessons, but by and large, if the church is a satisfying place to be, people will tolerate, even begin to enjoy, any number of evidences of character. So rather than a shopping list of minor things to get sorted, church leadership needs to quickly and consistently address itself to the bigger issues: the issues that are hard to identify and require years of patience and hope to fix. In the long term, the only way to build a successful worshipping community is to be aware of exactly what is going on, at depth, in the congregation and addressing energy and time to building it, healing it and maintaining it. This will result in making practical nuts and bolts changes, but often, not to the things people are complaining about. For example, when I arrived at St. John's ten years ago, it seemed to me, newly arrived and without any history in this community, that the greatly beloved and very beautiful church was inhibiting rather than facilitating the way the congregation functioned. Nobody was complaining about the building; in fact most saw nothing wrong with it. Nevertheless we got involved, fairly early, in making structural changes to the church and the church hall. The results have worked not just because they make things more comfortable, but because whole new areas of ministry have opened up for us and because the new arrangements facilitate the growth of our sense of community.
It is the sources of satisfaction that need attention and thought. Sort them out and the other stuff tends to take care of itself. As with church life, so with national life and politics.