I can only think that other people rate this book so highly because it panders to a desire to learn about the 'undiscovered' (and, therefore, trendy) cuisines of Eastern Europe.
Let me focus on a few of the negatives:
(1) For me, the word 'Feast' conjures up the image of special ocassions, of high days and holidays, when you share food with guests; New Year, Easter, weddings, birthdays and so on. The book never mentions these events, but is focussed on everyday food, including street food.
(2) The book should more correctly be called 'Everyday cooking from Bulgaria.' Take the two, meagre, references to Ukraine, for example. The text accompanying the recipe for Borsch appears to be a straight lift from the book, 'Culinaria Russia.' The second reference is to 'Pampushki.' These are flour dumplings sold in street kiosks; hardly a 'feast.' I haven't eaten one in more than ten years.
(3) Quite why the photgraphy of the book was awarded a prize, I'm at a lost. None of the photos has a caption, so you're at a loss as to what they show. The photo opposite the recipe for borsch shows a dish of grey coloured, unappetising, broth or casserole, but the recipe describes borsch as being crimson red. The photo quality, on matt paper, is not too good, either.
As a resident of Eastern Europe I am very disappointed with this book. Read it and enjoy, but please don't kid yourself that these recipes are for feast days, and remember that perhaps 75% are native to Bulgaria, whereas Central and Eastern Europe is very diverse.