There are many websites on the internet which have great designs, are easy to navigate and have quality content. But, there are far more websites which have none or few of the characteristics which make a website "good."
Sometimes websites are designed by an inexperienced designer, who thinks design is about pretty colours, mind-blowing high-resolution graphics and "fantastic" animations on navigation buttons. Other times, they are designed by non-designers (ie web programmers) who think it is about the content.

www.thisisenglandmovie.co.uk - The Y Design Awards' 2007 Best Online Campaign
A good web designer will understand the importance of getting the correct balance between aesthetic elements and the actual content (the stuff the visitor wants: an article in case of a blog).
