Genre tags are incredibly useful, but only if you tag your artists in a way that you, personally understand and that is directly useful for your own music library.
An artist may be simply tagged as "Electronic" on the Wikipedia, but if you have several hundred electronic artists in your library, then you'd sub-categorize your %genres% into "Berlin School Proto-Ambient" or "Minimal Darkwave" or anything so long as it's aids in the navigation of your collection.
In my own library, I rely heavily on genres, (often substituting a record label in the %genre% field if I have a complete discographic archive of a particular label with a consistent sound.) This way, I can employ dynamic playlists to quickly create "mood" or "occasion" stations on the fly.
BOTTOM LINE - use whatever works for you.
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