Comment by CydeWeys

Well you're responding to a different person, and my font rendering is fine (and I would fix it if it weren't). I'm just pointing out that if a lot of people are having problems reading a site for whatever reason, the site should probably be doing more testing on different configurations, and not be doing such fancy things with font weights. Another common complaint I have is sites using gray text on darker gray backgrounds, which can turn into an unreadable mess on lower contrast or lower brightness displays (like a mobile phone with the screen brightness set lower to save battery).

And FWIW, I'm on a stock MBP, and I just revisited this site and disabled the font-weight: 300 rule on the body text, and everything became a lot more readable for me (if less "stylish"). I think the site might simply need a slight design tweak for readability.