Really? I would consider Germany to be in second place as far as who has the best tanks (first place I'd put Russia). I'm going to just make the assumption by saying you're making errors (such as leaving your sides wide open and/or facing medium tanks against heavy). Not trying to call you out or anything, but there's a reason why Germany vs Russia are always facing each other.
I mean, yeah, they're knocked out easily (such as getting flanked); but so does pretty much every other tank in the game. And the King Tiger will rape everything in its path.
If you want bad armor then check out Japan. That'll be disabled simply by a soldier chucking a rock at it.