If a book has really awful formatting or major errors, it's usually mentioned in Amazon customer reviews (for the Kindle version, of course). Bad formatting is often a matter of taste. Some people want spaces between paragraphs, others don't and so on. Missing text is actually quite rare.
I always fix the formatting myself in the Calibre editor if I don't like it. There's no reason not to purchase a book I want to read only because it's not formatted the way I want. That can be easily fixed. The only exceptions to this are bad conversions from PDF, mostly seen in self-published books, but I encountered it once in a Google Play tradpub too (returned it and bought the Kindle version). With those I won't bother and usually return them. Fortunately it is rare.
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