Japan is actually overpowered. Ho-Ri are the best anti-tank in the game, with pioneers the Japanese have let rooms cheaply than single people a ground unit with the fully occupied cities. In tanks Japan is enormous variable. The Chi-Ri there are cheap, SUPER CLAMP tanks that are perfectly suited just for early offensives. At the same time you have with the OI but also extremely strong tank for the end game. The artillery gun is ideally suited to woods with enemy AT-Guns without properly cleaning losses, and once you get a larger number of OI's can call his own, is also heavily armored enemy units with the artillery gun let off without that the own tanks enter the opponent's reach. In addition, Japan has with the Ha-To on the best artillery of the game.
Also Air units of Japan need not be afraid have to compete with other nations. With the Zero can bring fast cheap fighter on the battlefield that require no research. In addition, the airport is the Japanese after the Britten 2nd cheapest in the game, just what's in the early game is not a disadvantage.
Nevertheless, I find the price a bit high, in view of the fact that it is more than twice as high as that of the main game and one for basically receives only one additional people.
For RUSE lovers still a must!