There are many places on the web that talk about good visual design vs. good content/function. While I agree it takes both to make a truly great website, visual design opens the door for the visitor to go in-depth and engage your site.

Nature.com has an article titled “Web users judge sites in the blink of an eye” - where they say:

Lindgaard and her team presented volunteers with the briefest glimpses of web pages previously rated as being either easy on the eye or particularly jarring, and asked them to rate the websites on a sliding scale of visual appeal. Even though the images flashed up for just 50 milliseconds, roughly the duration of a single frame of standard television footage, their verdicts tallied well with judgements made after a longer period of scrutiny.

In the crowded and competitive world of the web, companies hoping to make millions from e-commerce should take notice, the researchers say. “Unless the first impression is favourable, visitors will be out of your site before they even know that you might be offering more than your competitors,” Lindgaard warns.

They go on to say:

For a typical commercial website, 60% of traffic comes from search engines such as Google, says Marc Caudron of London web-design agency Pod1. This makes a user’s first impression even more critical, he explains. “You’ll get a list of sites, click the top one, and then either say ‘I’ve engaged’ and give it a few more seconds, or just go back to Google,” he says.

Link: Web users judge sites in the blink of an eye