This book frustrated me a great deal. It is certainly excellent, and the evident passion of McMurrin for Mormonism shines through with a clean, sincere light. Still, as someone moderately-read in philosophy, and with a lifetime of experience with Mormonism, I had some serious issues with this text that prevent me from giving it a full-throated recommendation.
First, while McMurrin is clearly an expert on both Mormonism and proficient in the larger theological fields which he frequently defers for comparison, his analysis struck me as little more than "academically standard." What I mean is that his familiarity with all relevant material seemed no less impressive than that which is to be expected from the works of protestant theological authorities of all stripes. Nothing in this text struck me as elevating him above or beyond what is considered standard (if undoubtedly rigorous and effective) fair. The main advantage McMurrin has in this respect is that, in the realms of Mormon theology, he has little-to-no competition. You would be hard pressed to find anyone who has sufficient familiarity with standard theological discourse and Mormon theology to do this topic justice. Credit where credit is due.
What I found harder to forgive was the many moments his agenda detracted from the text. In reading this book, I increasingly got the feeling that this was a text meant as manifesto and evangelizing tract for the eyes of liberal religionists everywhere. As such, Mormonism felt like it was being sold, as much as explicated, with the side effect of occasionally disingenuous descriptions that stand in sharp contrast with his normally effective analysis. McMurrin is correct in arguing that Mormon theology has fundamentals compatible with, even manifesting, radical liberal theology, but that is not the case in every particular. You wouldn't know it from his writing.
To list some prominent examples, McMurrin characterizes Mormonism as 'materialist,' positioning a dualism where the 'spirit' stands as a more refined category of matter. Well and good, this is certainly radical. He then proceeds to position Mormons as believers as kinds of 'naturalism,' as opposed to the 'supernaturalism' of popular Christian theology, so that 'spirit matter' still operates according to material laws, even if those material laws remain unknown (or unknowable) to the physical body. No magic here! This seems to me to be a patent misrepresentation of naturalism, for which physical relations and scientific inquiry are king, as well as a very limited reading of Mormon thought, which has repeatedly emphasized the supremacy and inaccessibility of 'spirit matter' from 'physical matter.' This even McMurrin latter seems to acknowledge when he concludes his book by saying, "[Mormonism] must reconcile its supernaturalism with its own naturalistic and humanistic propensities." Such a qualification of Mormonism as both 'supernatural' and 'natural' was notably missing in his more extensive previous analysis.
Also notably absent from his fundamentals is any discussion of the epistemology of theology of Mormonism. This was also neglected in his 'Philosophical Foundations,' but this becomes a much more obvious omission here. I do not think it is controversial to say that, as a revealed religion, reason and empirics are subordinate to revelation in the economy of Mormon knowledge. What's more, this revelation, at least in its most intense and detailed nature, must be funneled through credentials and forms uniquely abiding in Mormonism, thus producing a superior inspired theology. While revelation is not unfamiliar to theologians, this all sounds much less radical and presents as an exclusion of other liberal discourse from the philosophies at hand. That these foundations were not included detracts from the fullness of McMurrin's descriptions. Some passing nods to 'revelation' are insufficient corrections to this.
Also glossed were details including the theological survey of heaven, with it's radical divinity, as well as the legalist/literalist/apocalyptic strains in Mormon thinking. These were briefly mentioned as opponents to be rhetorically defeated in his analysis, with as much economy as possible.
Having got this all out of my system, I will conclude that the vast majority of the content in this text is good. If compared to the field of alternative surveys of Mormon philosophy, I would give it 6 stars. As it stands, compared to contemporary theology by other writers, it is a good survey of the subject from someone who cares a great deal about the future and soul of his faith tradition, and it's hard to be mad at that.