I found this thread in Steam's Reddit page. Well, Valve somehow did it to hundreds of games, and perhaps thousands, but a lot of user scores were scratched out. Most of the games that had modified scores are Indie.
According to one user who put up a spreedsheet shows the difference. The one game that is largely underrated is Elves Adventure (with a 52% difference!) and the one game that is largely overrated is Simple Ball: Extended Edition (with a whopping 74% difference!). As for Heaven Island Life, that user's average rating went with a 51 to a 5!
https://docs.google....MnD0/edit#gid=0
Edited by zocom7, 14 September 2016 - 10:55 PM.