1) Much of their content is original (i.e. not copy-pasted from other sites)
2) A majority of the page is composed of text, rather than images or ads
3) Where there are ads, they are minimal and largely hidden from view.
4) Their website is well organized, with clear and descriptive links.
5) Their website is updated frequently and new content is posted regularly.
So, assuming that WSWS is linked by other sites on the same topic, it seems that it should rank highly in Google search queries. Maybe there is something else that would reduce their ranking, but it doesn't seem obvious to me at first glance.