It's a La Palisse truth that the Red Army performed terrible on the first two years of war, even if it's consensual that it had a strong superiority over Germany in men (in June 1941 not much, but later) and material:
Frontline strength (June 1941):
3.8 million personnel (Axis)
4,300 tanks
4,389 aircraft
7,200 artillery pieces
Frontline strength (June 1941):
2.68–2.9 million personnel
Overall strength (June 1941): 5,500,000 personnel
15,000–25,000 tanks,
35,000–40,000 aircraft (11,357 combat ready on 22 June 1941)
http://en.wikipedia.org/wiki/Operation_BarbarossaAnd Stalin had terrible responsibly about that for being caught unprepared, notwithstanding all the warnings, and for killing and removing some of the best prepared and experienced officers in 1937-1939.
(see
https://bitcointalksearch.org/topic/m.6916918).
Even later, save for Stalingrad, the Red Army won most of the battles out of their superiority, not superior tactics of their generals.
But after the disaster of the 1939-1940 Red Army operations on Finland (a 4 million population country!!, what an humiliation...), one shouldn't be surprised.