Well written and entertaining. Probably best described as travel writing rather than a travel guide, since many of the places mentioned in the book were only vaguely described in terms of location etc. We had the book with us when we travelled to Galicia last month and, as well as enjoying it as a riveting read first and foremost, we also occasionally used it to help us track down some out of the way locations and food. I would highly recommend trying to recreate the author's lunchtime tapas run in A Coruna - we certainly got to see some places we'd never have found without his help, and it was one of the highlights of our trip (though, out of respect for the author, we hid the book whenever we went into somewhere that he mentioned)
If you are reading it purely for the pleasure of the writing, and for the enjoyment of learning a bit more about spanish food and customs, then it's a 5-star. If you are hoping to actually use it to fuel your own odyssey through Galicia (a use that the author himself might well recoil against!), then i'd say it's a four star, since tracking down any of the places he mentions in the book is (i'm sure delberately) quite difficult, but that's half the fun! An index would be a great addition as well.