[dazc]

From the announcement linked to below: (https://news.ycombinator.com/item?id=10601232)

Ratings from evaluators do not determine individual site rankings, but are used help us understand our experiments. The evaluators base their ratings on guidelines we give them; the guidelines reflect what Google thinks search users want

[dhimes]

Ah so they probably have a specific set of sites that they check against. That makes sense- thanks.