That is highly subjective. One user’s gem is another user’s trash.
Yes, I agree with that point, and that’s what my system tries to do (or at least it will try to do that when it is implemented 😅).
If I understand correctly you want an algorithm to detect underrated games.
Now, I don’t want to create the system that does that. My idea is to create a system that suits every user’s tastes. The original post was about the small part of that system, so I didn’t bother to describe the whole idea because this is not the topic of a discussion. If you are interested in more context, see my reply to @user22 below.