I played as the Germans, and well, the Sovs came and get creamed badly ... In the end they got the PzIVs, and the Tigers were out of AP ammo, shooting HE at tanks , but Sovs had maybe 3-4 tanks left, some immobilized, total defeat to them !
Well, it is recommended that you play the Russians vs the AI. You'd need to really crank up the Russian advantages if you play the Germans.
My best attempt vs the AI so far was to KO all the Panzer IVs, immobilise one of the Tigers and kill about half the German infantry. I had around fifteen tanks left (all of which bar one controlling a flag exited the map) and a couple of immobilised stragglers - tactical defeat!
The Tigers are just really, really tough - I got plenty of hits but they just bounced off, enough to keep them buttoned I suppose. The T34 needs to get a lower hull side hit from under 100m to stand a chance of KOing a Tiger, which I certainly didn't manage - especially as they are chucking out half a dozen completely lethal rounds per turn each
IIRC the original COI scenario was hard to win as the Russians, but fun to play of course
Cheers
Martin