In a previous article I detailed why as early as 1939 one could see that at least in terms of the equpping and manning of Nazi Germany's Wehrmacht (armed forces) that quantitative measures were proving less important in comparison to the qualitative in deciding the size and shape of Germany's military machine.
When most people think of the Red Army circa 1942 they imagine a war machine on the rise, and blessed with fleets of wordclass T-34 medium tanks. On the one hand it's true that by the spring of 1942 Soviet tank factories cranked out far more T-34's than they had during the nadir of Soviet fortunes late in 1941. But, for a number of reasons (including both T-34 losses at the front as well as the decision to parcel out T-34's in independent tank brigades versus concentrating them in the Tank Corps) there were never enough of these reliable, well armed armored fighting vehicles to go around.