Exit Interview...

As I leave my current job next Friday, next Thursday I am set to do an exit interview. Having been directed by a friend who also resigned from my work that I needed to ask for one, upon resigning I did just that. However now that the time is set I am a little concerned as to what an exit interview really entails. I am basically of the opinion that it is a chance for me to bitch about all the things that have pissed me off while I have been working here. And there are many. From the manager who thinks that "ethnenticity" is a word, through to the MD who told me "you have a lot of potential but are of no real value to the company". In fact I think I should start making a list.....