I finished this up last night, mostly just to get it out of the way. It wasn't an impressive read, or and important read, but at least I can say it gave some background information on why certain black personalities were less than charmed with Cosby - even before his salacious history came to fore.
Michael Eric Dyson spends most of his criticism on Cosby himself rather than the particular messages the man would argue. Which is not unexpected, though I wish more substantial arguments were offered to refute some of Cosby's worldviews. A lot of the time, Dyson would fall back on a sort of conciliatory stock argument that admits there is some truth to Cosby's arguments, but it probably would be better if Cosby wasn't a dick about it. And, true enough, not being a dick is better than the alternative, but it doesn't make for an effective rebuttal when many of your points can be boiled down thus.
The most memorable chapter is the final one, where Dyson examines the mentality of white people, and how Cosby's messages are designed to comfort them at the chagrin of the black community. There's some interesting theory there, perhaps enough to flesh out into a better book that's not overly concerned with finger wagging Cosby.
If you're looking for some perspective on Bill Cosby's career, I suppose the book has some of that, but it's not a balanced message and doesn't have much to say on the black community besides.