Browser Friendless: You may got bored hearing about this when it comes web design, perfect working on different web browser can be a key factor giving priority to different website with aspect to its design quality

Optimized web design factors : An experience web designer understands the important of speed of the website so the website designed by him already be optimized with different scenario like image compression, browser caching, use of CSS sprite and other ways.

Good Design structure for better user experience : When two websites collapse with each other in getting more quality, user experience is the thing which can sort out the weakness of any website with aspect to its user friendliness and user experience.

Themed objects from smaller to bigger one : All objects and elements of good website design must be given style which highlight the theme of the business or main purpose of website for which it has been built for. From logo to small button and links in design must have style with Inherited business theme.

Ability to pass SEO standards of Search engine : Most of the search engine have certain design limitation and restriction and they are unable to crawl or index the content of the site if any website passed these limitation. We must check search engine compatibility for better indexing and crawling of the website.

Above are four main aspects to differentiate websites from bad one.