A old article which dont get any or just a few visits is still a good article, so that would be a bad way to rank pages or force a webmaster to delete or place it somewhere ells. If a page dont get visited dossent mean its bad
It is hard to tell if the page is bringing down your whole site or not, so we just delete it usually. Like SGT, we use Analytics data, but for the last six months not 14 days. If a page didn't receive any traffic, it got deleted unless we found a link to it. Over the last year our site went from 22K pages to 14K.
We are still purging. I don't compare traffic per se, but SERPS. Day-to-day traffic fluctuations don't tell us much. A few of our SERPS did move up, but we still have a ways to go.
Now we are going through the remaining pages one-by-one to determine their quality, traffic etc. We are just deleting them.