Measuring Article Quality

One of my projects is to create a wiki like site for revenue generation, specifically aimed at technical professions such as architects / engineers / tax accountants etc.

One of the problems considered was how to rate the article content, so I have looked at the various strategies (star ratings seem worse than like/dislike, which seem worse than like only).

My thoughts was to layer a tag taxonomy over each article so that the authority of the author could be determined based on topic, an issue raised at

http://drvidy.wordpress.com/2008/02/18/measuring-article-qua...

I have thought about outsourcing the article generation to the usual places, but I am concerned about creating low quality "content farm".