mememax - 10:16 am on Dec 12, 2011 (gmt 0)
Google answers this in:
One other specific piece of guidance we've offered is that low-quality content on some parts of a website can impact the whole site’s rankings, and thus removing low quality pages, merging or improving the content of individual shallow pages into more useful pages, or moving low quality pages to a different domain could eventually help the rankings of your higher-quality content.
Just choose what you want to do with that page. If you want to delete it better a 404, if you want to work on it or merge content, noindex it until it's fixed.