You must have experience teaching!
I do not, but my wife does. She is a professor of English and she relates stories to me of her classes daily. One thing that helps her classes is that she always explains why they need to learn something, and she never introduces a lesson that doesn't further her own learning outcomes that she has set up (for intro classes she structures such that students are ready for her upper level courses, and for those courses she structures such that students will be able to succeed not only in English but also in other areas as well).
One thing that's very common (check out the CCCC literature on the subject, and as a matter of fact my wife is presenting there this week) is trying to find ways to ignite student engagement. You have thousands of extremely bright people who expend countless hours simply trying to figure out how to make students care. That to me does not point to a failure of teachers. And on that let me recount my own college experience:
I was a shitty student for undergrad. I didn't go to class, I didn't do the reading, I didn't do the work, and I failed all the tests. And this isn't just for classes I dislikes, it was for all of them. There was no specific reason for it though my wife and I were broke the whole time, but really that's just an excuse I told myself. And so eventually I brought my GPA up from a .5 to a 2.6 so that I could graduate (it was very fucking hard to do that, the system is stacked against you mathematically). Then I decided to go to graduate school and I kicked ass and took names. I don't know what changed but I became "the surprise star of the class" (professor's words) multiple times and when I graduated I had a 3.9 (only because by the end I had 3 full time jobs as well as taking a full course load, so I phoned in a final assignment that was worth a huge chunk of my GPA in one class).
In all of those cases it had nothing to do with my professors. They were kind, entertaining, generous with their time, and worked very hard to try to keep me engaged. The turn around came when I decided to take ownership of my education and of my career afterwards.