Note this book is "the presidency of GW," not "GW the president." Washington tried to stay above the fray as much as possible (both to imbue the office with dignity and to limit his tasks to what the Constitution explicitly required), and so others, such as Hamilton, Jefferson, and Jay (especially in his treaty with England), are the major players in the administration, although Washington is always hovering in the background.
I had not heard of Forrest McDonald until his recent death was noted in National Review. I was certainly impressed by his work in this book. The biggest issues of the two Washington administrations were, first, dealing with state and federal debts from the war, and, second, maintaining neutrality in the war between England, France, Spain, and others that broke out after the French Revolution. McDonald deals quite ably with these issues. Hamilton is, of course, the hero. Note that you can be a supporter of a strong central government in the late 1800s without being a statist today. Some seem to think that conservatives are hypocritical for being fans of Hamilton without being fans of, say, Woodrow Wilson, but that is not a contradiction (and that's true even without considering the fact that Wilson considered himself a Jeffersonian, which of course he was not).
A third major issue of the day was partisanship (or, Federalism vs. "Republicanism" as understood at the time, or, Hamiltonism vs. Jeffersonism). Again McDonald lays out the issues well while showing how Washington managed to appear above it all while certainly putting his thumb on the scale on the side of Hamilton. As an aside, it's hard to grow in respect for Jefferson, Madison, and Monroe as men when one reads about this era. They were such vain, conceited, rude men. Are all politicians such? Perhaps not. This criticism is not a substitute for fair evaluation of their accomplishments and failures as public figures; it is merely an aside.