The answers you have gotten so far are all very actuate. There are many aspects to getting traffic to your Hubs.
There are as many different ideas about how to write a hub as there are different ways to do it. In most cases however the search engine needs to know exactly what your Hub is about.
Usually it just takes time to be seen. It takes time for people to find your Hub, read it and if they feel compelled make a comment.
There is one area that you can get noticed quickly in and that is within a niche. Most of the articles I have written are about getting traffic to your site, article or whatever.
You must properly SEO an article in order to gain any clout with the search engines. Then back link or use Hub pages to backlink to your website. It is usually best to send traffic both ways, to and from your site/blog.
This article should be able to help you SEO your work to give you better odds of being found by the search engines.
There is a world of help an knowledge here in the Hub community. Stick with it be patient and happy Hubbing.