I have a bunch of pages set on
noindex. Does the title on these pages influence ranking or SEO factors in any way for the rest of the indexed pages? Or can I leave them using generic title?
No, it does not influence in ranking, because that pages is not indexed at all, also it does not harmful for your site in some ways, but if you are placing too many noindex tags, then those pages will kept some PageRank or JuicyRank.
Most of webmaster including me using noindex tag on specific directory, that have no quality content for example, list of links(example), or assets directory for images or some demo codes.
But, I recommended to use proper title for better User experience, in specific cases, where user land on that pages many times
There isn't only Google in the web. Many services don't use
noindex, but do use
description. So i would recommend - don't omit them.
As my previous speaker said, there are some entities in the web beside search engines, called user:) they consume titles and descriptions too, i.e. in form of tab or window titles, bookmark or share titles and descriptions. Or would you prefer, that all your pages, which aren't indexed, are called like old good