Your algorithm for calculating final score seems flawed. For example, if I give location as best rating but pay sucks, the company's rating is still pretty good. In reality, pay matters much more than location. You should adopt overall happiness as the final score and leave everything else as details instead of doing average or weighted average of individual score. Also other questions you might want to include:

* Do you think, on average, you work with smart people in your area?

* Would you recommend this company to your friends?

* How do you feel about management/politics/agility?

PS: I like the idea of using Linked-In profile. Nice.