Why is Aramark food service terrible?

I’m trying to dig up some dirt on the quality of Aramark food service at colleges and universities. I myself went to a university where Aramark served the food and it was, of course, terrible. I wanted to find more sources though around the nation. I tend to run into lots of blog posts, but I was hoping for something more official and credible. Apparently I read that a lot of schools condemn Aramark’s quality and stop having them as their server. Does anyone know which ones stopped having Aramark? Even better, have you attended a college/university where Aramark served?

Also, what are some GOOD food services out there instead for colleges/universities?