[omaranto]

I doubt there's anything actually wrong with the HTML that Org produces that would keep you from putting it in a blog, but you can certainly configure things to your liking. At the very least you can easily modify the HTML preamble and postamble, the javascript script tags and the CSS in style tags that Org's HTML export produces. All of those are just strings stored in variables that you can customize: org-html-preamble, org-html-postamble, org-html-scripts and org-html-style-default. There's more stuff you can configure by just reassigning some variable, see the file ox-html.el.

If tweaking those is not enough for you, you can write your own HTML export. You wouldn't have to parse Org syntax: you'd receive the Org markup already parsed into a nested list structure. If you don't use many Org features, writing an Org backend that supports only those probably isn't that much work. And you'd have ox-html.el to base your own backend on.