Look in Scripture. Churches are messy. They have good leadership and bad leadership.
People can get a solid seminary education at the most liberal, conservative or Scripturally consistent seminary. It takes a great deal of preparation and study to remain consistent without falling prey to preset opinions of what makes a good Christian pastor.
If a church of 1000 dwindles to 50 doesn't mean the preaching or pastoral care was bad. If a church of 50 grows to a 1000 doesn't mean it was good.
I think seminary training is vital. But if the person comes out teaching "5 steps to a better marriage" then there money was wasted. They only learned to be a motivational speaker. Not gospel proclaimer.
There is a great deal of bad theology in churches. And a lot egos unwilling to admit to it. They staked their entire ministries they are correct in their interpretations. So much so many have become nondenominational.
Egos lead churches today.