Yvonne,
Of course students can provide feedback, but in many cases their comments and ratings can be skewed by subjective assessment based on lesser grades, feelings of material too hard,or resistance to class or school policies. Yet, there is an element truth tucked away in every comment, so as we reflect on the student perspectives and end of term evaluations, we can try to weed through the untrue subjectivity, and try to sort the nuggets of truth that, if we're honest, can be found, applied and model us to become better at what we do as instructors.
Barry Westling