Content is kind. Everyone knows that but "not all content is created equal." Search for anything on Google, click on a number of the links in the SERPs and you'll discover that the articles are almost the same. One blogger wrote the article and others did some simple re-writing and posted it on their blogs. If someone has read the article and they land on your site and find content that they saw on some other site then odds are they may not come back to your site because they don't expect to find something there which hasn't already been published elsewhere on the net. So how do you create valuable content which can't be found elsewhere on the net? Visit forums in your niche and take a look at the questions being asked. Your blog posts should answer those questions. That content would not only be valuable but it would also get your more traffic because no one can find it elsewhere on the net.