The first version of the game the Germans are a lot more vulnerable to blizzard, so much so, the effect has changed quite a bit. As for supply, you will never achieve what you might read about, the level of supply is much higher than what history indicates. Again, it is a trade-off for playability.
Of course, historically, how many German formations surrendered during the blizzard offensive? None. Actually, the Axis still took prisoners during this time. Is this system perfect? Far from it, but it's closer to what should happen (breaking the Landers from being such a threat) that any other point in time. What they are doing in WitW with limitations on rail lines should go a long way to rectifying the supply lines. I hope they keep most of what they have, and bring over a new logistic system for WitE 2.0.