typical bad formatting is...
Large margins, large paragraph spaces, large indents, small text, large wasted space for the chapter headings, small space for section breaks, & poorly done simulated blockquotes. This makes for a mess when reading. It has nothing to do with OCR errors or any other textual errors. This is just the formatting. This is the sort of mess I go and fix. It doesn't take long and once done, the eBook looks good and is readable.
All of that