As a scanner and a validator, I certainly feel more qualified when I've scanned and read a book to write a synopsis than I do when I validate. Maybe I am too casual about validation but I have given up trying to read everything I validate. I check it for rank spelling, look for valid page numbering to try to detect missing or repititious pages, change some normal mistakes like die to the, but seldom do I get enough out of my validation to do a better job than someone who has actually read the book.