[4] On constitutional matters, Gardiner is considered to write with an insight achieved by the study of political philosophy, discussing in a masterly fashion the dreams of idealists and the schemes of government proposed by statesmen.
His record of the relations between England and other states proves his thorough knowledge of contemporary European history, and is rendered specially valuable by his researches among manuscript sources which have enabled him to expound for the first time some intricate pieces of diplomacy.
He is apt to attach an exaggerated importance to some of the authorities which he was the first to bring to light, to see a general tendency in what may only be the expression of an individual eccentricity, to rely too much on ambassadors' reports which may have been written for some special end, to enter too fully into the details of diplomatic correspondence.
His style is clear and unadorned, with more than a hint of Tacitus; he appeals to the intellect rather than to the emotions, and is seldom picturesque, though in describing a few famous scenes, such as the execution of Charles I, he writes with pathos and dignity.
[4] By some estimations, the minuteness of his narrative detracts from its interest; though his arrangement is generally good, here and there the reader finds the thread of a subject broken by the intrusion of incidents not immediately connected with it, and does not pick it up again without an effort.
And Gardiner has the defects of his supreme qualities, of his fairness and critical ability as a judge of character; his work lacks enthusiasm, and leaves the reader cold and unmoved.
[4] Gardiner wrote other books, mostly on the same period, but his great history is that by which he is widely known, and considered a worthy result of a life of unremitting labor, and a noted example of historical scholarship.