The visually perfect site might attract lots of attention because it is just pleasant to look at. But if the content is poor or low-quality will you keep coming back? If a site has a high level of quality information but is not as visually stunning will you keep coming back? I would argue that the site with the quality material is far better than the visually stunning site with poor quality.

You can of course have both, but if you have to have a site that is stunning visually make sure that your content is at the same level of attractiveness. Focus on quality and relevance and you will get many more visitors and potentially many more customers!