The expected "Damage Control"-Post.
Couldn´t have said it better. Everything Russian is fine, even when the faction is totally over-performing.
The biggest problem with IS-2s is the OKW lack of a reliable and affordable anti tank solution in the form of a real AT-gun. Yes, you can get the Raketenwerfer, which is affordable but only comes with 50 range and thus isn´t reliable. Or you get the Jagdpanzer IV which is reliable but you can´t afford more than one. Lose it and you lost the game.
The Panzerschreck + Raketenwerfer combo mixed with one or two vehicles here and there for OKW
is way worse than
Pak walls + fuel caches + lots of medium and heavy tanks for Ostheer.
And even Ostheer (with the better AT) has troubles dealing with the IS-2. OKW is just fucked.