Well, I try to take into account everything I say in the review, good and bad, with regard to functionality, durability, and cost.
What do the ratings mean?
Exceptional! A leader in the category.
This is very rare, and you won't have more than one of these in a category.
Very good, one of the best in the category.
Quite rare, considered among the best of a category.
Good, it'll do the job and do it well.
The product is better than average, a very positive review.
Average, it'll do the job, but it's not outstanding in the category.
Below average, has some kind of flaw.
This is a fair product but is flawed in some notable way, still a decent product.
Poor, don't bother.
This product is not recommended.
Dangerous and/or stupid.
This product is total crap and it's only being mentioned so you can avoid it.