I have not looked at the code of HN. Is it public? And what parts of it are terrible?

I think single pixel spacers and such things are of a different quality than the design (code) flaws brought up about WP though. Their impact is different. One merely influnces the layout of things while the other for example influence how whole themes are structured and how many pitfalls WP developers set up for themselves by writing unmaintainable code.