I have also attended many classes here at UND the last few years, and it seems no matter what level of class I am in (short of some 400 level classes) there are always immature students who complain about everything. Whether it's taking notes, doing homework, or just coming to class, they constantly complain as if they are being asked to do something unreasonable.
When you are in college, you should realize before hand that you will be needing to attend class and have to do homework for your classes.
As for immature classroom behavior, I don't think it matters what level class you are in, there will always be people fooling around in class, not paying attention, talking to friends, and whatever else they can do to not pay attention, including playing games on their laptops.
I sometimes think everybody should get thrown into "the real world" before coming to college so they mature a bit.