The Soviets didn't do too much damage, they just took up a lot of German resources. The death rate on the eastern front was 1 German to 10 Soviets. Quite a horrific scene on the eastern front, it was a trading of atrocities.
I think there would be heavier Allied casualties, but when you just look at the numbers, the Allies would have won. The US mobilized 11 million troops IIRC, and only 235,000 died. The UK mobilized around 4.5 million troops and lost around 280,000. The Germans, of course counting the eastern front, lost almost 3 million troops of the 10 or so million mobilized. In a war of pure attrition, which WWII probably would have been, the Allies would still have won.
The Germans would probably have had just as many resources, as they only would have been focused elsewhere. Vichy France would probably have just been outright annexed, Switzerland might have been invaded, and at least some token effort to land in Great Britain would have taken place.