I already said it is the way the Soviets used them. The war in the east was different from the west. The Soviets stormed the Germans over and over again, often without fighting until they were very close. Mountains of human bodies were created over which the next Red Army soldiers climbed to keep the assault alive. Same with tanks, the Soviets didn´t care for losses at all and we can´t blame them as that was their only chance to win. In the east tanks were also destroyed by the thousands by ground attack planes as such made up an own category of aircraft in the German and the Russian airforce. Beside airforce and tanks, also the German specialized infantry, field guns and artillery took their toll on the Russian tankforce.Then how come the Germans killed thousands of them? Soviet production was optimized to please Stalin, tanks made him happy, spare parts didn't. This is all commonly available information, all you have to do is look it up. The T-34 was no super tank. It had some good features and a lot of horrible ones. It had a good engine in the V-2 Diesel and a decent gun with the 76mm.