Never once did I say that the Sherman was a match for a Tiger, it clearly wasn't. But the tanker crews had air support. How about a Tiger vs a P47? An infantryman huddled in a crater or foxhole while artillery falling down felt no less terror or dread, and artillery beat rifles every day. But the war was not a series of one on one roll the dice engagements. Failing to look at the big picture is failing to understand what happened. Sailors of the Merchant Marine suffered higher attrition than did infantry, and they didn't even get to have medals or the like. My grandfather (mother's dad) worked in that realm and lost an eye while escaping a burning ship.
War is terrible, dirty, violent. The here-and-now of it is something none who experience it want to relive. Yet it is no fantasy world to actually understand the big picture, either.
In any case, there were only 1,368 total Tigers made during the entire war, production was halted in 1944 in favor of the Panther, which was supposed to be able to better fight the T34 (it was a sort of copy of the T34) but had dismal reliability. Some 50,000 Shermans were made. The bulk of German tanks in WWII were Panzer IV's. So, said M4 crew was most likely to face a tank against which they had more or less parity.