If you listen to an old Imam or shaykh, you will sometimes find it tedious to sit through the long pauses, listen to the cracked voice or try to understand the heavy accent or the old language (i.e. word choice) but you need patience.
I remember when my dad used to play a CD in our car, loaded with a lecture from an old scholar and I would groan. He told me that besides the knowledge, that would teach me patience. And it did. He taught me that I cannot dismiss people if I don’t find them immediately appealing.
It’s easy to listen to people who are good, eloquent speakers and if they are providing authentic knowledge, then go ahead and listen to them.
However, sometimes the wisdom that you need with the knowledge is only found with the older scholars, the ones who have spent their lives learning, contemplating and teaching the Deen.