Hmm, I think this aspect might put me off :
With a few exceptions, the author doesn't explain where a recipe comes from. I'm interested in traditional recipes and regional variations, and he doesn't explain which are the traditional ones as opposed to something the author made up. And he has made up a lot of 'modern' ones, eg Indian-style paella, new york style paella, paella with foie gras, paella with truffles, paella with champagne... and so on. Knowing which of the 80 or so recipes are traditional and authentic would help a lot.
Like the author of the comment, I would prefer to be told only about traditional, regional, recipes (after all, every region of Spain believes that its version of paella is better than any other) rather than include 21st-century "fusion" recipes and the author's own formulations. I'm going to pass on this one, much as I love both paella and a good recipe book.