User friendliness is a hallmark of good website design. A user should intuitively be led to right information without going about in circle, as it happens for many websites that are poor on navigation. When user is unable to find the information, they are seeking, easily, it is big turn off. So, the website must be high on website navigation.
The architecture of a website such as Silo Architecture accentuates navigation. So, if your website is informative and database intensive, website architecture can make database easy to organize and accessible. Websites with good architecture are high on navigation and the search engine prefer such websites. In this way, sound architecture, navigation, and Search engine friendly are tied together giving website a ton of good values.