One problem I've found with regard to citing sources is the current lack of support in MediaWiki for automatically numbered footnotes.
There are a couple of controversial articles I've been involved in editing for which I would like to go through with a fine toothed comb citing sources. My job would be made much easier if I could use automatically numbered footnotes in tandem with comprehensive templates such as {{Web reference|title=|work=|URL=|date=|year=}}.
I'm betting that once there is such support we'll find a huge upsurge in the quality of citing.
[[Wikipedia:Cite sources]] [[Wikipedia:Footnote2#Proposed future enhancements - autogeneration]]
Christiaan