In some cases usability can be bad enough to create a situation where you prefer worse content with better presentation. Sure.
But those are edge cases. No matter how bad a theme of a blog is, on the other hand, it is always secondary to content. There is a journalist's site that I frequent where some of his articles display all paragraphs as a single line. I cut ant paste to TextEdit to read them. He rarely writes an article I don't want to read. Still an awesome site.
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When evaluating the awesomeness of a site, layout is usually not the no. 1 concern, content is.
Content that can be effectively accessed easily and well. Why do I clarify that... here's an example, do you like experts exchange?
In some cases usability can be bad enough to create a situation where you prefer worse content with better presentation. Sure.
But those are edge cases. No matter how bad a theme of a blog is, on the other hand, it is always secondary to content. There is a journalist's site that I frequent where some of his articles display all paragraphs as a single line. I cut ant paste to TextEdit to read them. He rarely writes an article I don't want to read. Still an awesome site.