So, I take it the game makes field artillery (eg., large high explosive shells) virtually worthless or completely so against armored vehicles?

Just to note: I'm asking this semi-rhetorically as this is usually the case and totally incorrect. A 105mm howitzer will demolish a Matilda and did so on several occasions at Arras. Later in the war the same caliber weapon proved capable of caving in a Panther's glacis at ranges up to about 400 yards using heavy wall HE rounds.