It depends on what your compliant is. The subforum "Gripes" is another venue for students to voice their displeasures with the school. Another students write to the student-run newspaper The Acorn or go to the Student Government Association. Sometimes, it works best to go to the head of the department to which you have an issue with.
But isn't it a little premature for you to worry about compliants? You haven't even attended the school yet.