For some reason it really grates me when I read people’s definition of PageRank being “the quantity and quality of inbound links”. To me, “quality” is fairly subjective and doesn’t really accurately describe it. I prefer to use “value” instead of “quality” since PR is just a numerical value. See, there’s that word again, value.
The PageRank value assigned to a URL is just the result of a numerical calculation. A higher value does not necessarily signify importance or quality. It just means that it has a large amount of PageRank being passed to it. This could be from one high value link, or multiple low value links. Google uses other means to determine relevance, quality, importance, spam, trust, etc.
What do you think?