Dont even try to mix history with WWIIOL.
Like I said, the game is about balance, not historical accuracy. And you'll learn it when you get your Tiger tracked for the omphteenth time by a 20mm round from 1,5km. Ow and it dies ridicuosly easily too, even when shot at the front armor. That's why started to use the Stug3g almost exclusively, great tank, only lacks machinegun.
As for the allied tanks, well.. what can I say.. they are tough. Just few days back, I had a Sherman coming at me, I was in a Pak 50. I shot it to the tracks = nothing, shot to approx. where the driver should be = nothing, shot to the turret = nothing, another shot to the tracks = track damaged, turned to right, another 2-3 shots to the side = nothing, then it finally turned it's back to me and I got few hits to the rear armor and the back of the turret before it blew up.
Now, try that with ANY german tank and you propably end up dead with one or two shots from the Sherman.
