It is not a myth sherman armor in WWII was not very impressive until late in the war when the british upgraded the sherman to the "firefly" and the americans started production of the shreman "easy eight" model of the m4 sherman. But the 88 of the tiger and the 75mm on a panther could slice through a shermans armor with no problem at long range. I think in this game it might be the damage generator that is the main problem. Without researching the sherman armor prior to posting this I believe the armor on a sherman was about 2" or 3" max. On later models I am sure it was more but again the german guns like the 88 had no problem with it.
Well, you are part of the way there anyway. Let's see if we can move you along a bit.
In your original post you said:
Just like the current T34 we have it has good armor and speed.
Followed soon thereafter by:
Though the sherman has an upgunned package in the 17pdr it still had the fatal flaw of thin armor.
So, to bring it all together . . .
You are correct that the Sherman had 2" of front hull armor, which is 51mm. Guess what? The "good armor" on the T-34/76 you like so much was 45mm thick. Turrets, about 3", or 76mm on the Sherman. The "good armor" on the T-34/76 was 70mm.
So, whether you intended to or not, you echoed the "popular myth" that the Sherman had "paper thin" armor while the T-34's is "good," even though they are nearly identical.