I have ranked chocolate bars into the following categories. The top rank is excellent chocolate, and is reserved for chocolate that brings a smile to your face after eating it. The second tier is very good chocolate that is a pleasure to eat. The acceptable tier is good chocolate that fulfills man's basic need for chocolate, with no regrets.
Fair chocolate is good except for some slight flaws.
Unacceptable is for chocolate that has flaws such that one would eat it only if desperate for some chocolate, but eating it leaves one with unpleasantness. I rate separately chocolate bars , containing only chocolate, and chocolate candies , which include nuts, caramel, cremes, etc. Chocolate candies are an entirely different beast than chocolate, and to my mind, the boxed candies that are mostly ingredients other than chocolate hardly count as chocolate at all. A chocolate connoisseur craves the pure thing. My main interest is in chocolate bars, but I have included candies since there are some wonderful products that are not pure chocolate and hence must be ranked under that category.