The Net Delusion is a polemic and should be read as such. It is an angry and often overwritten tumult of evidence. There are arguments against some of what Morozov says, but none, I think, that can justify the full-blooded cyber-utopian position.
I think a problem arises simply from the fact that, as Bryan notes, Morozov is an apostate. His anti-utopianism is his former utopianism turned inside out and therefore retains much of the shape of the original mould.