I'm not quite sure what you mean by "it should tell us something." So, I apologize in advance if the following is a misunderstanding. (For the record, I don't much care about someone's HTML
per se. I'm talking about presentation. I'm not being a web standards fanatic, if that's what you meant.)
If you mean that they are all substance and no frills and that that's a good thing (or something along those lines), I would argue that presentation matters. You don't have to follow the latest fashions, but Crockford's site makes it literally hard to read his (excellent) articles. There are no margins. The line spacing is painful. Applying Readability to that page makes the article not just prettier but more substantive (because I can draw the meaning from it more easily).
Giving literally zero thought to the visuals of a webpage is comparable to giving literally zero thought to the order of a presentation or paper. All writing is partly about communicating, and giving no thought to such things is not cool and intellectual. It's likely to be lazy or pretentious.
(One of Giles Bowkett's posts about this page makes an interesting comparison of the visual layout of Hacker News versus that of the Guardian. Found the post: http://gilesbowkett.blogspot.com/2009/04/miniapp-hacker-news.... The bit that struck me is this:
> If you are a geek, you are probably consuming information in a less sophisticated structure then your non-geek peers.
I think there's some truth to that, especially in this case.)