An eyeopener--this is not just about Junot Diaz' book--but how establishment reviewers prostitute themselves to the "market." Check out the discussion in the comments on Reading Experience.
If you want to address the literary/aesthetic qualities, then do so!
To foreground the ethnic subject matter-and then claim, by innuendo, that the book wouldn't stand up to higher level critical standards--without explaining how or why... stupefying!
That someone like Romano is the bought-and-paid for "book critic" of a major newspaper says everything you need to know about the "authority" of mainstream critical journalism.