Creating content for e-commerce sites serves a number of different purposes. First, it needs to be attractive to the search engines so that people find your pages. but once you've got people on your pages, the content needs to be effective not only in encouraging people to buyer products but also in getting them so excited that they want to share your content with other people through links and social media which help your overall SEO.
It’s one thing to simply describe a product but people are little more complex than that. Going back to marketing 101, we don't sell products and services we sell solutions to people's problems. So make sure to describe more than just the product, describe how the product is actually used and take opportunities through photos, videos, animations or even step-by-step diagrams to really show your customers how this thing works and how it will solve the problem of their having.