While I agree with other reviewers that Graves goes over the edge fairly often throughout the book, the information contained in this book is very thought provoking and not really available elsewhere in one work. Some of the comparisons are pretty loose, and the book might better have been titled '10 crucified saviors', but still, the work attempts and succeeds at showing a prominent religious thread throughout history.
The writing style, while modern enough to be an easy read, IS from 1875 and lacks the modern understanding of a 'scholarly' approach. Having read MANY works on this subject, I can attest that most of the information is indeed correct, but his style is often inflammatory and somewhat obnoxious. He Really had a problem with Christianity and much of the book is devoted to this topic. This is probably great if you avidly detest Christians as well, but ocassionally annoying if your just trying to extract the relevant info from the book.
All in all, this IS a worthwhile read, but can be challenging because of the above considerations.