In my experience, there are two types of interviewers: those who make a person feel at ease in order to get a sense of who they really are and judge their candidacy accordingly, and those who believe an unrelaxed person, though unable to speak their mind, will reveal all kinds of things about themselves, like how sociable or strong they are.
When I am *being* interviewed, I definitely appreciate the first approach rather than the second. It helps with my anxiety a bit and I rarely feel as if I truly messed up during the interview regardless of whether I get the position or not.
