Any particular site will have its own unique scale and meaning for "quality", because quality is a measurement of a complex relationship of goals, purposes, audience needs, execution of design.

A cool design aren't going to sustain your development
If you are missing a concrete statement of the purpose and intended audiences for the site.

• Identify and understand your customers
  You must define who your audience is; if possible, gather feedback and involve your audience in your design process.
  
  
• Architect your information space for the user
  Information architecture describes the organization of your information.
  
  
• Define the Requirements and Specifications
  Requirements detail the objectives for a web site project; These two kinds of instructions are essential to the successful completion of any web site project.
  
  
• Document your standards and styles
  Standards are essential to the quality of any site: standards allow you to set a definition of "quality" for your site.
  
  
• Design an interface for the user
  Quality assurance doesn't focus so much on the best/coolest/most powerful interface so much as on answering the questions "does this interface meet the users needs?
  

  Quality assurance goes beyond quality control to examine the processes that create and shape the product.