Some judges will only scribble a score, others will write a couple of words, some a sentence and unless you know the judge it's hard to calibrate what value to put on the feedback you get. A few years ago the WBC judges were all told to improve their feedback or leave, it helped somewhat but still isnt perfect. Until a computer can score an espresso from an agreed baseline there will always be whacky human variables in any results including time of day they tried it.
Over the years that I've been at the Golden Bean I've seen a great improvement over the way coffees are made, delivered to the tables and judged. The Cafe Biz crew take all the feedback each year and tweak the process the following year to try and improve it. Judging the top scoring coffees with a set group of judges was the biggest single change in the history of the Golden Bean and has resulted in the top ones shuffling in order.
One change I would like to see this year (I've not mentioned it to them yet) is to deliver the drinks to different judging tables. Something I've noticed moving around a room of judges is that tables start to align their scores so you end up with a table of people who score light roasted coffees high and another table that score them low etc. Sometimes half the table is from the same company and they would all have similar tastes / scoring bias.
Even with judge calibration we all carry some bias towards what sort of coffee we rate highly. I remember having one espresso that was full of anise flavours... stunning and amazing coffee. My co judge screwed-up his face and scored it low. We debated the reasons for our scores for a while but in the end the scores stood and on average that entry scored "average" at best. For me, that coffee was one of the few that I wanted to buy a kilo to drink and one of the most memorable coffees in my life.
There are always other judging biases too. My example of that fat-anise coffee was it was a wonderful "journey coffee" but if I was opening a cafe with it I know it would freak-out most of the people that expected a "standard coffee" experience. We all expect different things from a coffee at different times.
At the Golden Bean I think it would be pretty hard for a really nasty coffee to score a medal and I think it would be unlucky for a great coffee to missout. On average they seem to get it pretty right which is why I was happy to trust their process in judging CS'rs home roasts.

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