I'll stop short of saying I hated it, but I really did not enjoy the book after some high expectations.
Being a biologist, I was very much looking forward to reading up on the theory of evolution and natural selection in this popularised form (having only experienced the textbook version). However, as other reviewers have mentioned, I found the style very dry, overly wordy and to be honest, very repetitive. I persisted through the first two chapters but then glancing through other chapters (in the hope that things would improve) I saw the same concept applied to different aspects of the species from physiology to behaviour and I just could not bear being beaten over the head with the same idea over and over again. Ok Dawkins, you had a good idea, but a whole book? Really?
The book at the moment has two problems for me. The first is its age. I think people going to university in the 90s and 00s must have learnt about evolution/natural selection with Dawkins' ideas in the background anyway and so probably the novelty of the concept has worn off over time. Second, is that Dawkins has taken a vaguely interesting idea too far. A thinking person will not buy into his many assumptions, oversights (especially in the second chapter) and sometimes circular arguments. It then becomes very difficult to stay with the author on his journey once you feel his scientific footing is dodgy.
I can see why the book has gained popularity among non-scientists as it does make Darwin's ideas accessible and his (many) examples are well-illustrated. Those already familiar with Evolution and Natural Selection: be warned.