This is how I rank stores. Using a 1-5 scale, if a store does a basic good job, I give it a three. Extra-ordinary service or pricing rates a four, and both together rate five. Two means a serious deficiency in service or over-pricing. One means egregious price-gouging or deception: illegal or near-illegal activity.
Croak! [2011.12.06 An omitted pronoun added and a bit of grammatical cleanup done.]