Be warned – these rating systems are a work in progress. They’ll change and maybe even be replaced as time goes on, but for what it is worth, here they are. (They appear at the end of the review in the Rating section, and also a tags at the very bottom of the post.)
Overall
This is the Yummy scale. To date, the rankings from lower to higher (left to right) are:
Umm | Yum | Yummy | Yummy-plus | Yummy-double-plus-good
Visual
This is a newer scale, to try to take into account the fact that wine is more than just about taste.