numnum - 7:26 am on Aug 7, 2012 (gmt 0)
Personally, I think if you have noindexed low quality pages that are 1 click away from an indexed page, the indexed page will still suffer on the basis that if google sends traffic to the indexed page, the visitor can easily find your low quality content.
So no-indexing a page that gets no direct search traffic and that provides little if any link juice (i.e., a so-called "low quality" page) won't help you in the SERPs. You need to go further by removing your own internal site links to those pages or remove them (and 301 redirect to a related high-quality page, for good measure). Otherwise, Google will still know you have so-called "low-quality" content and demote your site accordingly.
Have I got that about right? If so, this is simply perverse. Information providers such as myself who wish to cover knowledge topics in depth do so at their peril. Just scratch the surface, or suffer the consequences!