Nothing more frustrating to see bad reviews from people that could be helped with a simple clarifying or supporting email.
I would really love for Apple to add an option that asks a reviewer for permission to be contacted by the developer.
Or better, ask if the reviewer would like to contact app-support before posting a 1 or 2 star review.
The people that contact me are the ones that really helped me most to improve the quality of my app. Ironically, the few 'WANT MONEY BACK' customers even became the most loyal beta testers.
Just as background, my app is a remote control app for certain hifi equipment. It's on the store since 2009, is already optimized for iOS9 (side-by-side) and still runs perfectly on an iPad 1 with iOS 5.1.1. Average rating is 4*. It typically receives either 5 or 1 star ratings. The 1 stars are mostly for not reading the app store description, resulting in expectations it can't fulfill. Or there is some 3rd-party configuration issue like the iPhone not being on the same WIFI as the 3rd.party equipment. The app even shows how to identify and fix these but some people simply don't read and instead rather write a negative review...