By wich way ? I very disliked the way diificulty level was handled in HoI3, hope they did much better this time.
He said that increase the difficulty put malus on the player.
[Watch a skilled player play a game]
"Pfffft... this looks so easy."
[Play the game myself and get my ass handed to me by the AI]
"Oh..."
He's not that skilled. He's good, yes, but he did some mistakes. Like let some parts of his front open, don't encircle the enemy. Moreover, he didn't care about winter and snow and he didn't manage too much his divisions. He didn't play slowly. They even let the AI manage the war against Spain and Switzerland, so his level has nothing to do with it. He went through the pyrenees easly and with tank divisions... And he had a ratio of one man dead to ten killed.
So no, it's not just him, the game seems easy. And also too fast, they can't do long battles like Stalingrad here.
Still, maybe they played with a low difficulty or maybe the balance isn't over, I don't know. We can hope this will be changed.