The most successful interviewee you will ever meet is the one that is most experienced. Unfortunately, the experience they are bringing to the table is not necessarily work experience but interview experience. These are the folks that jump from job to job, are never satisfied where they are at, or are so miserable to work with that they have trouble holding a job for longer than it takes to get to know them.
Through constant interviewing they’ve learned what questions to expect, what order to expect them in, what the interviewer wants to hear and so on. Using a traditional interview style makes it impossible to weed out the truly exceptional candidates from the truly exceptional interviewee. We in turn become conditioned to expect certain answers and reactions in the interviewing process.