I think many people are timid about bucking a trend. If everyone else says a book is good and they didn't like it, they wonder if, perhaps, they're the odd one out. So they don't leave the unflattering review.
As for plot holes, too many of the established authors aren't even edited anymore. The thinking is that they're too big and too famous to have written a stinker. Not true, as many of us can attest to.
Joyce
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