This is a superbly written book. One of the best American authored novels I've read in a long long time. It's witty and brilliant, clever and insightful. The author has captured current American culture and suggested a discussion that the country is needing - what is the culture of the black person in America.
This book will be taught in universities, I predict: in anthropology courses, literature courses, political science courses; and it will be appropriate in each place.
I did not find the book vulgar in any sense of the word; rather, I found it honest and direct.