Job search and interviewing expert Rowan Manahan tells the brutal truth:
My number one piece of advice to candidates for job interviews is to drop the mask and be themselves. Everything after that is tactical. If you are not sufficiently confident to speak your mind and talk at a meaningful level about your approach in the workplace, then you probably aren't going to get hired anyway; and if you do, it may well be into a square peg in a round hole situation.
I work every day with people who are having difficulties in their working lives and the majority of them will point to unpleasant episodes in those working lives arising from untruths.
[Be sure to read all of Rowan's post and don't miss his mantra.]