From: Helsinki, Finland
I feel that the blizzard effects feel quite ok and right, but maybe it lasts too long.
If I read my history right, the original Moscow counteroffensive lasted from early December till early January, after which Soviet forces were forced to stop the general offensive since they also run out of reserves, and simply couldn't continue as the Germans defended more bitterly and defenses stiffened a lot. Also the organization of Russian armies didn't support continuation of huge strategic offensives everywhere due to the purging of officer corps and the lack of trained personnel killed or captured by the Germans during operation Barbarossa.
In other parts of the front (other than Moscow) there were some offensives, but they weren't as huge as in front of Moscow. At least the general maps from the winter 1941-42 show the front really moving greatly in front of Moscow (100 - 250km), but only a little elsewhere. Just near Tikhvin -> Volkhov, generating of Izyum bulge in the south and large attacks over the Kerch on Crimea. Elsewhere front was pretty static, as there were not enough forces to go about. And till the end of February fighting had simply petered out everywhere.
In my games it seems the casualty figures for Russians would be about ok, or just bit too low. The offensive also happens along the entire front instead of specific place, and is "less violent" than historical, as the front is not pushed back in large steps along this specific point of attack, but happens bit by bit along the entire front. In books I've read the general picture of these offensives is that it's a mad dash, instead of the slow advance it's now.
Losses for Germans would also feel ok to me, at least during this early December / early January, after which casualties start to mount maybe too much, at least according to my gut feeling. This in turn allows Russians to continue their offensive along the whole front for longer. I think there was a pause in fighting (meaning just huge strategic offensives) along the from from end of February 1942 till beginning of May. Mostly fighting had died out since January along the Moscow axis and continued in smaller scale in the south.