In practice, there is a real factual question behind this, namely whether or not a given mini really is underrated. (Whether or not we should care if it is is another question.) It does strike me that those expressing concern about underrated minis and those talking about minis that really don\'t deserve a higher score may very well be thinking about very different pieces. Fact is, most of us could probably find a few of each, both underrated and overrated. So, the possibility of one shouldn\'t really count as an answer to concerns about the other.
Whether or not its worth hammering out the proper scores, I don\'t know. Probably better to just take it all with a grain of salt. The occassional discussion thread seems a good venue for calling attention to a mini you think gets the short shrift, and if that happens once a week, so be it. Even then I wouldn\'t focus too much on the score. A simple comment to the effect that you think it merits a second look and then say what you like about it. A productive discussion would focus on the qualities of the miniature; that isn\'t well served if we end up fighting over the most appropriate numbers to attach to it.