To the question, what kind of tank was the Sherman? The answer is. It depends. It is about hard data and soft data, as how I would call it.
The hard data are the numbers and informations you can get directly about the tank, the weight, the armor thickness, guns etc. The soft data are a bit harder to come by. Those are crew experiences, crew training, battle experience, strategical decisions and the skills of the officers/commanders in the field and behind the battlefield.
Just because a tank is excellent on paper doesn't mean it performs excellent on the field. The M3 Lee for example was an outdated design that looks horrorible with its multi turret design. Yet, it proved to be a valuable little fucker in the African desert and the British troops using it loved it - for the most part. When the Soviets received the M3 though in the later stages of the war it got the nick name grave-for-5-friends.
It is easy to just look at the numbers and come to the conclussion that the Sherman or T34 for that matter was garbage. That is, if you take tanks like the Tiger or Tiger 2 as standart which saw the battlefield years after the Sherman and T34 have been developed. If you look at the most common German tanks however, which have been the Stug, Panzer IV and the Panther, things look a bit different.
The Sherman saw over the time upgrades which improved it's performance. Most noticable the upgrade of its turret and gun from the short 75mm gun to the high velocity 76mm gun used in the M4a3e8, also nick named easy8. But also upgrades to design, like the suspension, engine and amuntion storage. The Sherman in particular was actually a very save tank for its crew compared to other design. The Germans would store amunition all over the place in their Panzer IV while the Sherman had a wet ammo storage at least after February 1944. This design in particular was comparable to the Panzer IV H.
The British used their famous and powerfull 76mm 17pf as the Sherman Firefly. Those changes gave the Sherman a chance to engage succesfully both Panthers and Tigers head on on the battlefield. It was possible to penetrate the Tiger I from distances to up 800 meters and the Panther within 600 meters from the front - henec why the tank combat in Fury is inaccurate. The Firefly could engage Panthers and Tigers from even biger distances, combat reports speak from penetrating Panther turrets and knocking them out from up to 1100 meters.
Combat reports from 1944 directly after the landing in France also paint a more positive picture from the Sherman. Even those where the Sherman armed with the 75mm gun had to directly engage Panthers. The figures of 6 Shermans and 10 T34 for one Panther are exagerated, inaccurate and have no historical sources to back it up. Particularly as the numbers of deployed Shermans/T34 and destroyed Panthers in the war simply don't match with it.
The Soviets also received quite a few of the Shermans and what the Soviet veterans say about it can be read by Dimitry Loza:
Dmitriy Fedorovich, on which American tanks did you fight?
On Shermans. We called them "Emchas", from M4 [in Russian, em chetyrye]. Initially they had the short main gun, and later they began to arrive with the long gun and muzzle brake. On the front slope armor there was a travel lock for securing the barrel during road marches. Tahe main gun was quite long. Overall, this was a good vehicle but, as with any tank, it had its pluses and minuses. When someone says to me that this was a bad tank, I respond, "Excuse me!" One cannot say that this was a bad tank. Bad as compared to what?
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