Yes, article sites can help but no, you can't just post your Hub or duplicate articles of any kind. The idea of posting the same article across multiple sites is an outdated way of gaining backlinks, it doesn't work these days.
You need backlinks to raise your profile in Google's eyes. A link inside an article has far more value than a link on a directory or links page. A good way to do it is to write articles on various revenue-sharing sites (Wizzley, Xobba, PubWages, ThisisFreelance, Infobarrel, Excerptz) - that way you get the backlink but you also get revenue from the linking articles as well. But they all need to be unique articles.