I'm going to pop in and snipe without reading the whole thread:
The 1-10 scale sucks as a metric for reviewing entertainment products. It sucks even more when you start adding decimals into the score. Still worse is normalizing everything to a 1-100 scale (I'm looking at you, Metacritic).
If game reviewers need to give numeric (or pseudo-numeric) scores, a 1-4 star scale makes the most sense: 4 = must play; 3 = flawed but still worth your time; 2 = for fans of the genre/series/style only; 1 = avoid. Or, as Daily Radar used to put it: direct hit, hit, miss, bomb.