I clicked the link for one of my classes, and there's nothing available except for the Syllabus information. Is the site broken?

No. Not all classes at BSPH use CoursePlus. That's up to the faculty for each course. If course faculty aren't using CoursePlus, you won't see anything beyond the basic information pulled from the BSPH course catalog. Speak to your course faculty directly if you would like them to use CoursePlus and they are not doing so.