The Problem with Averaging Star Ratings

Opened the page of the app, and I see a review at the top that starts like this (I hope quoting it entirely is ok):

> First, THIS APP IS NOT RELIABLE IN AN EMERGENCY SITUATION. I will elaborate below on what's good about "Tornado" and what's bad about it. I'm a trained spotter for the NWS, so I have a phone loaded with weather apps. The bad: At least six different services/apps alert me when a weather alert is issued for my area. "Tornado" is not only always the last app to alert me, it is often delayed by 2 HOURS OR MORE. It also, for no particular reason, sends me alerts for warnings that don't affect any of my selected locations.

Now, how many stars would you expect?

Correct, it's 4, because:

> Tornado is quite educational, enough that I would recommend downloading it solely for the purpose of learning about the weather. It has easy-to-read articles with corresponding tests so you can discover how much of a weather buff you truly are. In summary, I would recommend downloading this app for the educational aspect, but be aware that a very key feature--alerting--might not be fully operational.