We don't post the criteria for positive ratings for two reasons.
One is it ought to be obvious what will bring that about. A track record of sales, good contracts, and fair dealings along with avoiding the obvious criteria that bring about a negative rating goes a long way. Doesn't mean we don't take into account musings, statements, complaints, and compliments from the rest of the industry, but those receive lesser values unless they're strongly documented.
Two is we've had some scams try to game the ratings by claiming they were as good as the businesses we rated favorably through the use of weasel words and such. So, since the criteria should be obvious, we've decided we won't post the positive criteria. We haven't any complaints from anyone receiving a positive rating thus far, so we're inclined not to mess with that.