My thoughts on KGS are that they are a very good symphony for Galesburg. The very fact that Galesburg has a relatively small population means that the odds of finding talented musicians are less than what they would be in a larger city. The salaries of Knox faculty members are pitiful, which means that the music department isn't going to be attractive to a lot of people. The symphony doesn't have a lot of money either - in particular since Maytag got outsourced.
No, they're not the best, and I'm not trying to say that you shouldn't criticize them - because you should - but I think that when all things are considered they do a really great job. Of course, since I worked there for 3+ years I am biased. :)