The NY Times agrees with the Onion:
It's a book that manages to be, all at once, an insider's history of manga, a mordant cultural tour of post-Hiroshima Japan and a scrappy portrait of a struggling artist. It's a big, fat, greasy tub of salty popcorn for anyone interested (as Americans increasingly are) in the theory and practice of Japanese comics. It's among this genre's signal achievements.
Check out Dwight Garner's thorough and thoughtful review of A Drifting Life in today's New York Times.