I would have to say that the worst thing about my school is that it's very boring. There's no major activities or groups to bring students together. There's also a lack in events to get the students more involved with the school. I would suggest to add some smaller groups to the campuses to bring students new to the campus together with the locals.
My school has the tendency to be a little impersonal. Because people come and go so regularly there really isn't any time for students to connect with other students and teachers to connect to students. People come and go before anyone realizes they were there.
I wish the classes were more challenging. It's not that the classes aren't difficult or the amount of work isn't a large enough load, it's the need for more critical thinking skill requirements.