mcmaster is the most polished ui/ux you know? To each their own but this is a very hackernews comment - it's very much a site for engineers but I can't agree it's a polished UI or UX.

To me: Sense of hierarchy is off, accessibility is meh, there's an enormity of information per page, there's poor use of color and spacing... it could be worse but I can imagine this site giving my designer friends a seizure.