if they really cared to fix it, it wouldn't take you leaving. i guess it depends on who's doing the exit interview. i could see it being beneficial if you have

if they really cared to fix it, it wouldn't take you leaving. i guess it depends on who's doing the exit interview. i could see it being beneficial if you have a lot of experience and trust with the manager doing the exit interview (e.g because he managed you before he got promoted). but if you've barely spoken to the person doing the exit interview, it's best to politely decline or simply shut up, so as not to burn bridges.