Nagel's review is well-written and charitable. He covers much territory by summarizing large swathes of Plantinga-philosophy in succinct paragraphs, all without sacrificing accuracy. (He even appears to have carefully read footnotes from Plantinga's other works.) His only objection seemed to be that Plantinga does not consider naturalist theories of mental content. Plantinga doesn't cover them in this book, but he deals with a number of them in a recent PPR paper.
So, as one very familiar with Plantinga's work, I was impressed with Nagel's review.