serious questions...

When it comes to worship, at what point do we become too critical, or maybe too delinquent? As I begin the process of entering into ministry as my occupation, how much do I do and how much does God intervene? Is there a "holier than thou" community that would dare criticize the worship of another community? I may say, I have been there, and by grace am exiting that mindset. At what point do we simply say, "Lord, Have mercy?" May these questions always stir us to never become complacent in our ministries. To you my friends, Christ, have mercy.