Cumulative user ratings
Ok here is what you can do:


Attach a Five Star field to the user
Create Views block that shows the users. Select to show fields and only show the Five star field.
Use a contextual filter in the View to filter by User Id(uid). Select "Provide a Default Argument" -> "User id from URL" -> "Also look for a node and use the node author"
Place this block on the page. Restrict it by content type if you want.
When someone Views a node then they will see the Views block also and can rate the user. 


You could put Header text area in text in the View to give the user instructions. You could also display the user name, picture or other information if you wanted.

This is way I could think of with the least amount of modules. If you were already using Panels you could use Panels to place the Five Star field on the node page but I won't suggest installing Panels just for this use case.