Too much white space, not scannable, poor font color/contrast, no indication of what is a link until you hover over it...
...nothing that couldn't be rectified in about 10 minutes of CSS dabbling.
go there with javascript disabled, they are using radio buttons and a submit button to vote up/down
I'm still confused. unrdln and ycombinator both have black links, but at least unrdln has an underline onhover. And Hacker News has lower contrast in general and poor line spacing.