A tank thas was designed more for providing “artilery” support to the the troops (it carries a artilery cannon), than to be a “tank-killer”. In order to attack it needed to be at least 300 metres close and its fire power was everything but scary.
At the other hand, its mobility made it extremely famous at the Allies forces (British, Canadian even USSR forces used it) and its ability to move fast and hide good were key factors to the fight against the panzers.
When the USA forces landed in Normady, had to use a tank, and the Sherman was their undoubtedly choise. But the did not really knew, what it was expecting them.
The Tiger, was the definition of a “tank-killer” tank. It carried an anti-aircraft gun and could destroy a Sherman(or a T-34, that had better armor) from 500 meters. Its own armor was almost indestructible, but the more in number and faster Shermans, soon made the Tigers not look that scary. The US Air Force, finally, when gain the ability to send fighters on patrol in the European heartland, started to destroy the Tigers easily, due to their incapability to hide properly.