How do we express our negative points to the interviewer?

There are a couple of ways to express something that is
contrary to glowingly positive elements to an interviewer.  I think that the critical
element is how one presents the information in an interview format.  Essentially, the
person being interviewed is not known, as they are an outsider.  Hence, while their
insight is valuable to an extent, the lack of familiarity has to be acknowledged.  When
expressing such thoughts, I would suggest that being able to preface the thoughts with
something that shows a sense of constructive criticism evident is going to be important.
 For example, if the person being interviewed feels that the company recently made a
questionable decision, it can be expressed as, "I have always liked the direction of the
company.  Which is why I am wondering about a recent decision and would like to get your
input on it."  In a statement like this, there is an acknowledgement of something good,
and a willingness to state a "negative" thought along with an opportunity for
explanation.  It's important for the interviewee to be able to present themselves as not
necessarily a final authority, as much as an interested party that can contribute
something of value in terms of thoughts and insight to the organization.  This would
mean moving away from the idea of a "negative point" and rather embrace the concept of
constructive thinking.  In doing so, the interviewee can show sensitivity and thought
while being honest and forthright during an interview.

If
the question is referring to how one talks about their own areas of challenge in an
interview, then I think that the same principles apply.  It is important to be honest in
discussing one's own limitations.  No one is perfect and I think that savvy interviewers
understand the difference between someone who is being insincere in describing
themselves and someone who is being authentic in their self assessment.  It is important
to point out a flaw in one's own approach that is recognized as an area where
improvement is being pursued.  For example, if one is too intense about what they are
doing, the way it could be phrased is to suggest that, "While I know I have a tendency
to become very occupied with a project, I am working on being able to take a step back
and gain some focus in how I progress with my work."  I think that individuals have to
be honest about where they see their own need for improvement and be able to state what
they are doing or will do in order to become better at it.  There can be no right answer
here because each individual possesses different faults that cannot be "screened."  One
cannot say something that they are not because there will come an eventual point where
the fraudulent claim will be revealed.  Yet, being able to discuss one's own weaknesses
and talk about how improvement is going to be evident is a part of professional growth
and reflection, elements that are appealing to interviewers and any
organization.