Amazon gives 7 days (or something similar) to return ebooks. I have zero compunction returning an egregiously poorly formatted book, and marking it as a quality issue.

One of the most annoying things about ebooks is that there is no standard (de facto or otherwise) that publishers follow. If you pick up a print novel, odds are that there are no spaces between paragraphs, and that paragraphs are indented. You'll see whitespace, or some decoration (asterisks, etc) separating scene breaks. What about an ebook? Who knows? Depends on the publisher's whims.

I really wish there were standard CSS classes that denoted various things, like: paragraph to start a section, normal paragraph, scene break, etc. Then we could have our ereaders tailored to what we like.

Until then, I use Calibre to fix things that are fixable easily, and I return things that are not.

One book I got was entirely typeset in bold. Who does that?