Wow. I've never had that kind of casualty count happen before in a game. Every game for me, consistently, is Britain, America, and the USSR each losing 4 million men each, Germany losing 6-8 million men, Japan losing around 2-3 million men, and myself a few hundred thousand.
Personally, I think there are too many DIVISIONS in the game, but that's just me complaining about walls of infantry spanning the longest borders without seeing any real unit diversity on the enemy's side. I know that in-game divisions are significantly smaller than IRL divisions that operate over multiple in-game provinces.