I've always considered the MB to be better than most systems, because it uses several individual axis addressed independently. None of the traits exclude someone from having any of the other traits (besides the polar opposite). One thing the test you linked doesn't do so well is focus on the gradients of each. I'm pretty strongly introverted and intuitive, but the other two are rather borderline, switching depending on timing and the test. From my understanding, it was originally developed as a tool for psychoanalysis. By placing the patient in a category, the psychoanalyst could then more easily focus on releveant problems. However, Jung's theories, off which the MB is based, have largely been passed over in the academic world. So, while a detailed analysis done by a professional (as opposed to a 12 minute test) could be useful for a patient and therapist, the use of MB for employment purposes is slightly terrifying. Plus, apparently even as the theory was first being published, there were questions as to its validity and that of the methods used to arrive at it.