We decided that your average 1 to 10 rating scale was boring, so now we use a beer scale! Unlike most rating scales of this nature, a full beer rating is actually the worst, with an empty beer being the best.
The reasoning is that if your beer glass is full, you clearly aren't enjoying the beer at all or you would have drank it. Likewise, an empty glass means we immensely enjoyed the beer, and are ready for another. Then, of course you have the in betweens. I think you can figure those out.