[..]
Russian tanks were just thrown out, the t-34 tank was only good due to the numbers in service and the early days before the Germans up gunned , they got eaten up like flies in battle afterwards with a massive K/D ratio against them.
[..]
The early T34s, made carefully by skilled people from decent materials, were very good at the time.
The later T34s, made by unskilled people in a mad rush from whatever was available and obsolete and with the design degraded from the original design (which would still have been obsolete anyway) to simplify manufacturing were crap. But they could be made in silly numbers very quickly and that mattered. 5 crap tanks can beat 1 good tank. It wasn't a nice decision, but it was an effective one. Probably one that the Germans should have been more aware of, since they defeated the superior French tanks in the early days of the war the same way.