Planet13 - 3:59 pm on Aug 26, 2010 (gmt 0)
Could you elaborate a little bit on what you mean by low quality, since you mentioned that they do not contain duplicate content.
Would it make more sense to remove those pages entirely and set up a new site with a relevant domain name and put them on that site? Then 301 those pages to the new site?
Or, how about changing your internal navigation so that they are more interlinked to one another (assuming they are all on more or less the same subject) and then only having one clear linking path into it from the rest of the site?
I really think that the internal linking structure on that encyclopedia site that starts with the word wiki plays a big part in why they rank so well (and why users like them so much).