We're only a year into the conflict - a year into WW2, the Soviet Union was losing large swathes of territory and million-man armies to German encirclement. Even when they had the numeric advantage (e.g. Finland) they suffered disproportionate losses for the same reason they do today. I presently anticipate that what happens in the upcoming months/years will mirror what happened back then - they optimize wartime production, conscript a large number of their population, and think of new technology to kill people.

Keep in mind that this is all coming from an armchair historian. It's easy to have a selection bias when comparing such things.