The shermans could kill tigers, but could only do it from up close. If you were dumb, and went right at the tigers, you got to lose a lot before you got the Tiger. If you went around, attacking to the spongy ground where the 60 ton Tiger couldn't go, you got to live. Shermans had a fast power traverse. Panthers, Tigers, and Pz4Js had manual traverse turrets- slow slow slow.
The Germans only made 1500 or so Tigers during WWII. The US made around 50,000 Shermans, and 1600 Pershings. The Soviets made about 10,000 T-34s, and rather fewer JS-1s.
Doesn't pay to be dumb in combat, no matter what your equipment.
Good info on the Sherman, with over 50,000 produced but your numbers are off on the Russian production, which was far greater than 10,000 T-34s...
Russian Tank Production:
There are other disadvantages the Tiger had. It was also pretty slow. Shermans had an advantage in a wooded environment because the long Tiger gun often meant that a trees would block the turret traverse that the much shorter Sherman gun could easily clear. Maneuver quickly into the woods to the slower Tiger's side or rear and hit him in the thin side or even thinner rear armor. Instant flaming Tiger. The Panther was the better tank of the two -- Big gun, great speed and mobility and well-armored. It and the T34 were the best.