www.opensuse.org is the single most accessed page in the SUSE/openSUSE universe. With 1.5 million visits per month it generates 2.5 million page views and has around 500 people on the page at any given time. Yet it's one of the oldest, crufty pages we have!
It doesn't concentrate on what it should do: Tell people about the distro so they download it. It's design is 5 years old, it's not mobile, it's not accessible. There is absolutely no interactive, engaging content at all and the technology used goes as far as a shell script/cron to update dynamic content.