People said all kinds of bad things about Stintzi when he was here also. He laid it out for you, "I am not here to be your friend, I am not here to babysit you, I am not here to be your parents. This is DI cross country and it is a different level than where you came from. I am here to be your coach. Some of you will make it and some will not..." That kind of thing.
He developed about 5-6 guys who ran 28:45 or so either during school or just after. Schell, Jurcevich, Kyle Baker, there was an Australian ... Even though he had concrete, demonstrable success with several males and females people would complain about him. Mostly people that didn't see the way to 14:00 and 29:00 was probably going to involve more work than high school.
Everyone I have talked to about Drenth has had good things to say about him, those of who who are complaining I think are putting too much importance on the role of the coach. As a few have alluded to, unless the coach is as bad as Gibbard, it usually lies with the athlete more than the coach.
Wisco, PSU, Illinois, Indiana, MSU, OSU, Michigan, and Minnesota cannot ALL be top-three in the Conference and qualify for Nationals every year. There isn't enough talent to go around for everyone to have a solid year and even if there was people peter-out sometimes no matter how good or bad the coach is.