The sherman helped alot to win the war because it was made to be easy for front line repairs so they could pull the engine out or parts of the body and quickly change them or repair it unlike most germans tanks that where to much hardwork and technical to repair on the battlefield. It was also made to be factory friendly so it could be mass produced in a very short amount of time, again rather then the technical german tanks.
An example of this would an Ikea table that is easy to setup right out of the box and broken parts can be fixed or changed quickely, unlike a victorian mahogany table