"Authorial we" is/was common in academic writing although its usage has declined nowadays. Shouldn't be mixed with "royal we". Rather it's meant to specify "the author and the reader", that is "I and you" (even if what you do is basically follow along an already done work).
Right but in this case we is being used to express quite personal opinions and so is not appropriate (my first instinct was, in fact, in total sincerity, that the author has a multiple personality disorder/DID)