Sites are listed only in the virtual libraries, not in the top few levels of the hierarchy. Each virtual library has a different layout and structure. Most, if not all, have their listings further broken down into sub-categories. In effect, the WWW Virtual Library is at least six levels deep in some places. In addition to its hierarchical listing, the WWW Virtual Library has an alphabetical listing of the 290 virtual libraries.
Some volunteers describe some or all of the sites their virtual libraries link to.
Others do not. Some who do describe sites write longer descriptions than others. I can't really say anything about the directory as a whole because the individual parts are so inconsistent. Without exception, the sections of the WWW Virtual Library I have seen do not rate the sites they list. A new search feature allows you to search all of the virtual libraries.