the dog ate my book report. the dog will starve

So writing reviews is pretty damn hard. Not quite as hard as writing a query letter, but still. My eyes actually go blurry as I try to craft the simplest phrasing, which strikes me as a symptom. Someone I respect said, somewhere, that the content of reviews is unimportant to the sale of the book. But who was it,and where did they say this? Did I dream it? I hope not, because I just told my class that it was the truth.