True...provided the Wallies could supply their air forces in the east via rail lines.Normally,allies would be fucked.BUT :
1.Soviet air forces sucked - Rudel bombed them during day in Ju87 in 1945 till he was out of fuel.Soviets could not attack during day,or not for long.
Good point. Though at that point the Soviets had much better morale and the relatively inexperienced and smaller Wallied forces would seem like easy meat, so it wouldn't necessarily be a good idea to go against Stalin.2.In 1941 soviet mass surrender till german start genociding them.If allies do not genocide prisoners,it would start again.
After all the behavior of German troops in the East was well known by 1942, but still ~1.7 million Soviets surrendered that year. It only dropped off in 1943 when it was clear that Stalin was not going to lose the war.
Per OP the Soviets still get their historical Lend-Lease to make things more fair, because without LL they'd lose too easily.3.No Lend lease for soviets - they would practically fight on foot without trucks.
Considering that all - draw.