So hostile so quickly...
Axis have some very powerful units in the late game for sure, but Soviets and brits do as well. The firefly is incredibly powerful anti-tank, and the Crocodile can melt any infantry, or at gun is seconds and can withstand huge amounts of damage. The IS2 is on a par with all the other heavy tanks and the T-34-76 is the most cost effective medium tank in the game.
I would recommend you play axis long enough to get ranked and to a position where you lose a game, or two or 10 and see how you get beaten, then use that same strat when you play allies. There are also plenty of people streaming their 2v2 and up games, or Youtube videos.
This game/community has some of the most extensive resources to learn the game with. There is no excuse not to learn anymore.
top 400 as OKW, pretty ez placement to be honest. Anti infantry is so strong, and late game unstoppable.