I run a site called TransparentCareer (https://www.transparentcareer.com) and we've tried to make all of this data quantitative and verify that the person actually worked at the organization and what role they were in. We are getting ready to release a qualitative type review/question answering system using the same verification method and you will be able to see what department within the company the review is in reference to.
I would love to hear how people think this could be done better as we are currently developing the product and would love if it could solve this need in the best way possible. Is employee verification the biggest problem or is it something else?