-A 70 fuel light TANK doesn´t survives neither 2 tank shots, 3 Shreck hits or 2 pak shots.
-It´s an AC, not a tank.
-Cost is irrelevant.
-I think some might agree that it was better to balance around the old slow-high damage IS2.
Again, i´m not saying its OP. It´s just weird how viable is to take out heavy tanks with an AC.
I think it's better to view it as a baby M10 dressed up as an armored car. It costs as much as an assault gun and more than a light anti-infantry tank, it has the range, penetration, and DPS of a tank destroyer, and comes fairly late CP-wise.
Not saying it doesn't or does overperform for cost/timing, because I haven't used it much.
The Sherman is indeed powerful but I don't think it's cost effective. It's 380 mp and 135 fuel, which makes it the 2nd most expensive tank in the game, a lot more expensive than a Panzer IV yet is on par with it.
In my opinion, the sherman seems like it has strengths and weaknesses, but the strengths synergize with each other well while counteracting the weaknesses.
For example, compared to the 'brawler' medium tank, the T-3485, it has less penetration, which in theory should counteract the very high DPS of the gun. However, due to its extreme speed, it can very easily flank and cost-effectively beat much heavier vehicles.
It has low HP and the same armor compared to the T3485, which would mean it would be weaker to weapons with high penetration that virtually ignore armor, such as the Pak 40. But at the same time, its speed allows for easy flanking- and makes it very difficult to faust. The top-mounted machine gun, together with high rate of fire on the main gun, means it decimates infantry and the Pak 40 should it catch it for even a second without support. I've had engine-damaged Shermans circlestrafe a Pak after the AT gun missed the first shot as it approached.
And despite being a very good flanker and infantry killer, it costs just a smidge less than the T-3485 while, and can beat any german tank below T4 head on. No tech costs means it's spammable, and it doesn't come in a doctrine where all other abilities are bad- because Lend Lease certainly isn't.
Again, just my opinion from fighting against it. I haven't used it in many games yet, so I might be wrong still.