I certainly agree with those five-star reviewers about the thoroughness and depth of this volume. It offers up a vigorous defense of a robust Christian worldview, and does so in a way that is unmatched by any single volume of which I am aware. There is much good philosophy here, from its consideration of contemporary issues in epistemology, including the internalist-externalist debate and Plantinga's views on warrant as proper function, to a rare and careful discussion of issues in general ontology, then a careful assessment of alternatives to dualism in its discussion of the mind-body problem, and on to its work in the philosophy of time, God's relation to time, and various concerns in philosophy of religion.
But I have found that the majority of even the best undergraduate students find it all but incomprehensible. I suppose one nice thing about this is that it makes me feel needed: they couldn't get through the text without a guide. But I know that many students are simply frustrated, with the result that the hedonic calculus ranks their first encounter with philosophy on roughly the same level as a root canal or a prostate biopsy. Keeping up class morale has become a sisyphusian task.
This raises the question: Where is the market for this text? For what level is it intended? It is described as an "introduction," but, from several semesters of use, I do not recommend it for introducing undergraduates, unless, perhaps, they are in an honors track or the like. Nor would I think that the class time of graduate students is well spent in this text, as grads should be ready to head straight for the Kripkes and Kims and Quines. Perhaps it best serves as a ready reference on one's shelves as a primer and/or refresher for those who have been introduced by kinder, gentler means. And it could prove to be a valuable single-volume resource for pastors, theologians and seminarians. (But for this anecdotal caveat: a bright and well-educated theology/biblical studies colleague of mine recently confessed his struggles with it before moving on to something else in disgrace.)
A less significant point: Here in my third semester of use, my own copy has physically fallen apart--cracked spine, loose pages. I have not used the book to mash out hamburger patties or to play fetch with my border collie, so I might have expected greater longevity.