I don't quite understand what this is for: I understand that I can look up that fartappreview.com is at say +3, which means that it is either rated good by at l

I don't quite understand what this is for: I understand that I can look up that fartappreview.com is at say +3, which means that it is either rated good by at least two people (and perhaps unavailable to a third one), or bad by at least two, but featured on Techcrunch? I don't know what to make of that information.