One of the congregations I attended was populated by the most bigoted and pious body of elders you could ever imagine. They liked to compete with other congregations in the circuit in the statistics front, and they were never content unless they were top of the league.
This congregation had the most pioneers, highest average hours, most studies, highest meeting attendance etc... It was so ministry-orientated that if your hours dipped below around 15 you would find that your name would disappear from the notice board, (i.e. prayers/watchtower reading/service meeting items & demos) and if it dropped below 10 you would get privately counselled by one of the elders.
Those were the most unhappy years of my life, because I worked so hard for the truth, but I never felt that I was good enough. Jehovah would only bless me if I worked so hard I would be mentally and physically exhausted all the time. If I fell short it was because I didn't have enough faith, and my prayers weren't earnest enough. Many people I knew were forced to go to other congregations to escape the pressure. This reinforced the status of the remaining ones.
It's often the luck of the draw as far as congregations are concerned. When you join a congregation it takes a while to figure out if you "belong" there. How many people do you know go to the congregation that matches their personality rather than going to one that they are supposed to go to because they are in the territory? Half my congregation do not live in the territory, and there are many in our territory that go to other halls, generally because of a clash of personality with one of the elders. How many do you know repeatedly fail to get appointed as elders and ministerial servants in one congregation, only to move to an adjoining congregation and become what they want within a year? Also how many do you know are forced to stand down in their position, and leave to go to another congregation to get appointed again? This disunity is so common, and it was one of the reasons why I started thinking that it may not be the truth after all.