I've found that if you read enough marginally OCR'd books, your brain will start to automatically translate them
But I have read many better than acceptable backlist books, Rex Stout's Nero Wolfe, seem pretty darn good, as are the Hard Case crime I think that many publishers are making the effort to improve back list books as many are not stocked by bookstores any more so it is extra revenue. (I should say older books instead of backlist, as backlist is by definition still carried in stores)
Three years ago even library ebooks could be pretty ugly, they seem to me much better now regardless of when they were written.
Helen