I always find it best when a critic first outlines the platform upon which they stand. I'll do just that by saying I'm a 2nd year Zoology student, an avid follower and believer of evolutionary theory and an agnostic.
Do these facts colour my views on "The Selfish Gene"? Yes, no one is completely objective, not even the fiercest of scientists (anyone who tells you they are doesn't understand that the observer is as much a part of the system as the observed).
In my opinion, "The Selfish Gene" represents scientific writing (not just of the popular variety) at its finest. Richard Dawkins' fluid prose and vivid analogies illuminate the most complex of concepts. This is the perfect introductory text to evolutionary thought and I recommend it to lay and professional audiences alike.
As a matter of note, unlike many of the reviewers on Amazon, I reserve 5 stars for the truly exceptional works - those that represent milestones in their genre and medium. I class this book as one.
Dawkin's hard-line on evolution is not universally held in the field (many of his contempories label him an "Ultra-Darwinian") but the conviction with which he outlines his interpretation of Darwin's theory is intoxicating.
Please understand (precious few do) that though many in the scientific community do not completely mirror Dawkins in their perception of evolution, they still believe in it. Too many when viewing the ranks of biologists mistake debate for dissension.
There have been many people who have posed rather flimsy arguments against the claims this book makes. I implore that the prospective reader not be dismayed at any creationist criticisms that are slung against evolution; the same arguments have been repeated year after year for the last 140 since Darwin produced the masterly "The Origin of Species". They have all been effectively countered in the past and hold no water. Their constant recurrance has to do with the ignorance and stubborness of those who wield them; unlike the scientific camp which listens and constantly molds its views based on the validity of new evidence and arguments, that camp steadfastly sticks to their sandy ground.
Richard Dawkins, like the great Stephen Jay Gould, teaches us that there is "a beauty in this view of life" (Darwin, 1959). Spirituality and science are not at odds, irrationality in the face of evidence is the foe, not religion.
To those eager for more, I recommend "The Blind Watchmaker" by Richard Dawkins. This offers an equally well-written (unlike "The Extended Phenotype") and slightly more in-depth, if not as groundbreaking, account of evolution. Also, "Darwin's Dangerous Idea" by Daniel C. Dennett, outlines the social and philosophical impact of the theory of natural selection. Though this tome is daunting in its size, you will struggle to find a better tribute to the idea that changed man's view of himself and his position in the universe.