A horrendously indulgent piece of pseudo-scholarship. Bloom's avowed 'guiding question' in this book is investigating whether Yeats is more, at root, 'Shelleyean' or 'Blakean'. The former tendency he clumsily identifies as the young romantic's yearning for self-actualization & escape from the world (as typified in the works Alastor & Queen Mab). The latter tendency is the old man's yearning for self-transcendence & embodiment in the world. I have already articulated those two words better than he.
Nowhere throughout the book are the ridiculous crutch-words of 'Shelleyean' and 'Blakean' really explicated. There are essentially no substantive comparisons drawn, just hand-waving about 'influence' and 'lineage'. It is important to point out for those unacquainted with Yeats that neither Shelley nor Blake were actually formative for Yeats development as a writer, they were not his 'inspirations' nor particularly his canon, they are just Bloom's attempt at describing the two warring motives working in the mind of Yeats.
This book is truly horrendous, I recommend it to nobody. An empty, dry hovel of near-nothing.