There's a detectable populist-sympathetic slant that is detectible especially in the last third of the book, but such sentiment probably more accurately reflects the Greece that the traveller will find today than Ancient Athens.
More academic treatments can be found by Richard Clogg in 'A Concise History of Greece' and the sadly out-of-print 'Modern Greece' by C.M. Woodhouse.
This history will help the visitor make sense of modern Greece against the background of its diverse heritage. Illustrated with maps and line drawings, A Traveller's History of Greece is an invaluable companion for your vacation.