Yes and No, many directories just end up listing sites which we already have, it would be redundant to list them.
Many directories are set up purely to list other sites in order to provide text for Google AdSense and provide no other value.
Most general purpose directories are not listable.
A directory has to work harder, and bring added value to justify listing it.
So a directory that targets a specific subset of the universe and does it in a way that is unique is more likely to get in.