This is basically how I view my Barrel based Root Beer rating system:

5 Barrels: Exceptional. If you like Root Beer at all, or even beverages, you should try this.
4 Barrels: Very Good, solid Root Beer. If you like Root Beer, you will probably like this.
3 Barrels: Flawed, but interesting.
2 Barrels: I probably wouldn’t spend my own money on this Root Beer again.
1 Barrel: I would turn this down, if someone offered it to me for free.