"... personally I would not list a site that comprised nothing more than a collection of links."
But that's what directories are, collections of links, and the ODP is loaded with them. While you may not list those sites, other editors certainly will and with good reason in that "Guides and Directories" is an official category title that exists in nearly every Regional category including continents, countries, provinces and cities. So declining a site for being a directory is not a good enough reason given the structure of the ODP itself.
I agree that directories do not contain the kind of "unique content" that is usually preferred for inclusion in this directory, but they can be useful especially for niche areas. If you really don't want to add sites like these, I would suggest the ODP drop entirely category titles with the word Directories in them. But as long as they exist, then people like Justine will continue to suggest sites for inclusion - and why shouldn't they, the directory cat's are right there all but asking for sites to be added. (Actually, they do just that by way of the Suggest Url link that almost all Dir. cat's seem to have.)