The book, as is the case with others by Alan Turner, is elegantly written and quite thorough for the species examined (the chronological information and scale drawings are of particular value). Of course it makes an easier and simpler reading than, say, "The Big Cats and their Fossil Relatives", but after all it is addressed to a wider audience.
Nevertheless, even at this level of "simplified" paleontology, the information about prehistoric mammals' classifications (orders, families, etc.) is scanty (just a confused diagram) and not very well placed in the chronological context. A more detailed classification chart would be of great help to people, completely new to the subject, so they can better understand and remember, where exactly each examined species falls in the general design of things.
To be stingy about Mauricio Anton's handiwork would be gross ingratitude. The man is a real artist and very serious and talented at what he is doing. But it is obvious that all artwork is not of the same high standards. The individual species' drawings in particular obviously suffer in comparison with the magnificent work of the two-page spreads. Anyway the big cats are as beautiful as ever.
Overall a good book as a starting point but certainly not the best I have read on the subject.