It was only after I read this book that I realized the definition of 'contemporary photography' apparently means hold the camera on an angle and putting the subject slightly out of the depth of field so that they're nicely out of focus.
Yes Annabel has some nice photos and yes she does give some good advice, but just as the grainy, out of focus, slanted photos seen in a lot of ads today will look dated in ten years, so will these wedding photos.
Having photographed many weddings, I know that my brides would not want a portrait in front of a rusty door hinge, a 'spur of the moment' shot of the maid of honour's butt, or a shot of the groom and the ushers (page 48) in which the feet of the men closest to the camera are in focus and the faces of all of the men are out of focus. Blow that up to 11"x14" and it will look even worse than it does in this book.
I agree that you can have an unobtrusive style of working during a wedding and that you can get a number of off the cuff shots that work. Sloppy focusing, grainy film and turning the camera on an angle is not a 'style' of wedding photography. You can fool some of the people some of the time, but this style is doomed.