Really no comparison to Marshall or Kissinger. These Secretary of States along with the presidents they served. Formulated a foundationally solid foreign policy that have stood the test of time and not only benefited American interests but benefited the world. Part of this is not her fault in that the President has no coherent foreign policy. Neither of them have a vision when it come to foreign or diplomatic affairs. Such will probably be the same. As an executive (as opposed to a legislator) she has failed miserably as well.