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is-2 maybe isnt the best tank of the war but it doesnt matter. the goal is to win so the soviets tought how can they win and the answer is - many many easy to produce tanks - t34 . Don't forget that t-34 is medium tank so u can't compare it to tiger 1 or panther (also HEAVY tank - 45 tons!! ) t-34 is the greatest tank ever and win the war . dont forget also that the war is on russian territory so they have alot of problems with production of everything . if u compare t-34 to panzer 3 or panzer 4 or even sherman who u think gonna win ?!?! so stop watch brainwashing movies that say "germans are the best ,only russian winter stopped them" . in the end of the war russians have so many of su-100 su-85,su-76,su-152,su-122,jsu-152 and anti-tank guns which can destroy tigers and panthers that russians dont need tank destroyers they need powerfull weapon against fortifications so they can move forward to berlin . when the is-2 was under construction it was 2 options for guns - 100mm anti-tank gun or 122mm gun with HE shells .
p.s why u think german crew had more expirience than soviet ? the war in poland is very short and germans fight against infantry and cavalery - no tanks. the war in france for germans tank crews is moving forward to the english channel and no real fights .
and another thing - i read in comments that sherman is the best tank of ww2 ?!?!

this ugly **** can only be the best for americans who realize there is a machine called "tank" in 1941...