It dies in literally one shot, even shooting it at medium distance is ineffective due to the fact it's scatter was never fixed after the amount of rockets it fired was reduced and they changed how artillery works.
You need to be extremely close in order to hit anything with a reasonable amount of accuracy, and when it dies in literally 1 shot to any explosive weapon and dies easy to small arms fire that's a tough proposition.
It's also very very expensive due to teching. It costs almost as much to get a Panzerwerfer than to get a Tiger.
It also inferior to the Katyusha in every way despite costing just as much.
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And don't compare it to katyusha, they are both rocket arty, that is one and only common thing they have, one is slow and its barrage is area saturation/denial, other one is mobile and is meant to deliver alpha strike and back off.
T-70 and SU-76 also have same cost, are in different tiers and are guns equipped on T-70 chassis.
Similar doesn't equal to same and contrary to what you firmly believe, axis are not supposed to have everything superior.
I don't think nerfing is2 is a good idea, is2 accuracy is shit, tiger is better in that way. It might that is2 after this patch will be shit.
I'm all for nerfing everything that prevents medium tanks from being used.
If tiger will prove to be too strong in comparison, lets not buff IS-2, but nerfbat the tiger.
Its a high time for heavies to have exploitable disadvantages that would make it a decision, not breaindead upgrade for your armor.