Thank you for this thoughtful and detailed review and your overall, if qualified, approval of the book. However, I think you are a bit hard on me with your reasons for restricting your rating to three stars!
The subtitle is a quotation from Herodotus (IX.64) and if that does not lend it sufficient authority, it is, in my view, well justified by the importance of this pivotal battle in the history of western civilization, by its exceptional scale and by the closeness of the contest, and I feel I make that case quite adequately..
Mycale - Other reviewers have welcomed the attention given to this important battle as a bonus! However I think we would have been overselling the few pages that it was possible to devote to it if we had included it in the title.
It is true that this is the first book that "focused ONLY on the battle" and I think that is remarkable, especially at the end of a period of a couple of years that had seen three books published on Marathon.
Peter Green - I do not mention his book because I have not read it, so it cannot be said that I "largely borrow from it"! I knew of it but felt I had read enough in the several sources I do gladly acknowledge and been sufficiently guided by them. There comes a time (not unrelated to the publisher's delivery date) when you have to stop researching and reading, and make up your own mind about things and get on with the writing! A factor may also have been what seemed to me to be convincing rebuttals of some of Green's interpretations in those other sources.
Cyprus certainly merits more attention than it generally gets in studies of the era, but Cypriots had no involvement in the campaigning of 479 that I'm aware of, so there was really no justification for squeezing in any more than this very brief mention.
The "linothorax" - Thank you! It does indeed seem that evidence for the wide use of this form of body armour by Greeks in the 5th Century is very slight. The numerous vase paintings identified as depicting linen cuirasses could just as well depict leather or felt, or various combinations of materials including metal. However, I haven't yet come across any reference in 5th Century primary sources to leather armour worn by Greeks. Part of the problem, of course, is that the commonplace tends not to get specifically mentioned! In support of linen, it was not as exotic a material as you suggest. Flax was grown in the Peloponnese in the Classical era and, although linen was an expensive fabric, it must have been less costly than bronze. And making a linothorax seems to have required less time and craftsmanship than a bronze cuirass.
It is well documented that non-citizens rowed alongside the citizen "thetes". There weren't nearly enough Athenian citizens to man their navy at its full strength. "Resident aliens" and household slaves (often seen as "family"?) could have been as highly motivated as their citizen comrades to play their part in the defence of Athens.
Numbers - Always difficult, getting from Herodotus' epic headcounts to something more plausible but the number I actually settle for for Mardonius' army at Plataea is 105,000 (see the key to the battle-maps and the "Numbers" section that begins on p34). I include in this 10,000 Medizing Greek hoplites accompanied by the same number of light-armed, roughly equal to the Greek left (50,000 is Herodotus' figure). In my view, a Persian force of the size you say Peter Green argues, mostly comprising relatively lightly armed Asian troops, could not have caused the Greeks the major problems Herodotus tells us about.
I am glad you quite like my overall description of the battle and am grateful for this. However, on the one detail you pick up on here, I do make up my mind and give the Amompharetus story some credit. I believe this has its roots in a real event, possibly one of the major things that went wrong with the Greeks' over-ambitious night-time manoeuvre, but that it quickly acquired its own distorting mythology. The argument that the story can't be true because no Spartan would disobey a battlefield order is somewhat undermined by Thucydides' account of the battle of Mantinea in 418 (V.72) and here it was a king giving the orders, not a young regent, with almost certainly no previous experience at this level of command!
Penetrating power of arrows - I am confident that it can be shown, mathematically or by practical experiment, that a light, iron-headed arrow fired from a compound bow at close range could penetrate the thin bronze skin of a hoplite shield and the wood behind. Xenophon somewhere describes a lethal bowshot passing clean through its target's shield and body- armour!
Taking all this into account, can I perhaps persuade you to consider a recount of your star rating?