I had a friend and co-worker who agreed to a human resources exit interview, and she was glad she did it. She wanted the company as a whole to know she wasn't leaving because of any animosity towards the entire management team or executive officers. She just couldn't resolve a number of conflicts with her immediate supervisor, and she felt like the best thing for her to do was to resign her position and find someplace else to work.
She said the exit interview questions were general enough that she didn't have to do into much detail about her specific reasons for leaving. She just said that certain members of management needed to be more sympathetic to the plight of single mothers in the workplace. If her child became sick at school or a babysitter called with an emergency, she had little choice but to leave work and handle the situation personally. If her immediate supervisor couldn't stop making derisive remarks about her efficiency, then she needed to be in a more understanding work environment.