How do I view negative reviews for a podcast in the iTunes store?
Not all reviews get posted and sometimes the delay is days or weeks for some reviews to show. I believe the stars get updates much more rapidly as a human doesn't need to review those ratings like Apple does for the word portions of reviews.

This is similar to app reviews:


Is there a standard delay for consumer ratings of apps on the App Store?
Why do iPhone App Store ratings and reviews seem to get processed so slowly?


I believe if you put star ratings in and feel they aren't updating, a request to the iTunes store support team might help unstick a podcast with problems updating. https://www.apple.com/support/itunes/contact/ and choose Store Support.