This is an alpha version, so don`t wonder about blank pages, code fragments flying around or many other wreid browsing experiences.
If it stays looking "did something explode here?" for a longer time than it's probably your browser's fault. You need HTML5 and CSS3 so just use an up to date browser and everything will be fine.
The site lacks usability?
Yes, definitely. Alpha as I said. It.... runs.
Basic features are missing and the cool ones mostly are still only built cerebral.