zahavasdad,
You can say how great the YU candidate is, He is more qualified. Got a degree in psychology , has a great personality and will get more people to come join the Shul
The thing is, both candidates may come off as qualified. Both may have degrees in psychology. Both may have great personalities, and both may cause 3,000 new families to apply for shul membership the minute after the first sermon. Both may have saved a kitty on the way to the interview. But one will preserve the Orthodoxy of the shul, and the other one will not. If that is important to the people in the shul, then they need to know. I think that is the point of the kol korei.