Does resetting the rating on an app also reset the top "Most Helpful" rated reviews?
I'm not sure about the rating of "Most helpful" reviews, but according to https://developer.apple.com/app-store/ratings-and-reviews/ it does not not reset your apps' written reviews.


  In addition, keep in mind that resetting your summary rating does not
  reset your app’s written reviews. Past reviews will continue to
  display on your product page.