No, USA, England, Canada, basicly the Allies, (I don't count USSR as one of the allies. They had a treaty with Germany right up untill June 22, 1941) won the war in Europe.
Russia doesn't want to admit that they even considered using western equipment and supplies, much less that they needed them for a while.
The T-34 was mediocre after mid 1942, and the T-34/85 was only OK in 1944.
95% of what you hear about USSR in WWII is just hype, and 95% of their successes were simply numbers. The IS2 was the only inherently good (as in not good because what it was fighting was worse) tank they produced, and even that had some rather large faults.