I recently came across
http://en.wikipedia.org/wiki/Category:Outlines
and it took me a while to realize the full extend of this desaster.
Some part of en.wp's authors is duplicating Wikipedia, this time
without text.
For example,
http://en.wikipedia.org/wiki/Topic_outline_of_Algeria is
a list of articles somehow related to Algeria. This purpose is better
served by either [[:en:Algeria]] (with full sentences) or by
[[:en:Category:Algeria]] (with proper software, without full
sentences).
My recommendation would be to delete them on sight. Given the
situation at en.wp, this is better done with a formal VfD,
triple-signed by someone else and already attached objections and
specialized templates for revision and arbitration, right?
Mathias