The unique UX of the site, driving around in a 3D car, is what makes this site go viral on occasion. If it were "good" UX, e.g. a standard portfolio site, no one would care and this guy wouldn't be as well known as he is. Therefore the UX is good.
I think it's not a website you make to get hired to make business websites like this to display information (unless maybe it's a gaming company), but if you want someone to make a game on the web then this is a perfect portfolio site.
