There comes a point in the journey of every Christian where cynicism starts to look inviting. Even mature.
But there’s a difference between looking for ways to make the Church better and looking for things to complain about. Mature, humble criticism is selfless and redemptive; immature criticism is usually self-focused and doesn’t generally lead to change.
Humble criticism means noticing a problem and articulating solutions instead of looking for problems and wallowing in anger. It means being temporarily disappointed without being permanently disillusioned.