How about Why are all Sherman tanks over powered.
Why is it you shoot someone in the front and it takes out their engine and not the turret or tank itself?
Why is you shoot the rear of the tank and it keeps moving away from you and takes 20 more hits to die?
Why is it you hit the turret and he still traverses 180 degrees and kills you with one shot?
answer them and I'll think about answering yours...Maybe!
shermans are not overpowerd...well the VC firefly is but it has a much better gun then the other 2...most tanks can still 1 shot a sherman
as for taking out the engine with a frontal shot ive never heard of or seen that one...but if you want a reason the AP shell passed threw the tank and crew/everything inside and hit the other end of the tank...farfetched but you wanted a reason....
as for shooting the rear of the tank most tanks require 2-3 shots to the engine to disable it and you have to be sure your not hitting the rear part of the tred... shooting tanks in the engine is not the best way to kill them...so it does tend to take 4-5 rounds depending on range
and if you hit the turret and its not down either
A the shell riccocheted
B it absorbed it or
C u hit just under the turret or
D you need to just shoot it more as most tanks at a long range still need 2-3 rounds to turret them...heck a tiger at 1900 yards can take 5+ shots to turret from another tiger panzer takes 5 m8 rounds to turret but only 2 at close range....so more or less massive factor is distance and shot placement
theres your questions answerd