Have you played and used it? Or are you theory crafting? It comes at 3 CP, which in case you didnt know is usually about the same time as T3/T4 for Soviet. So it is pretty useless and has paper thin armour.
obviously I played with it. 6 games after the patch, every single one I got 2 or 3 of them, combined with and without building Tier 3. Won all of them, StuG always had a ton of kills. I even built it when my opponent went for T34s after I got a P4 or normal StuG.
So, I don't know if you played with it or if you are able to use it correctly. For me, this unit is a pretty damn perfect unit for quite a lot of siuations. I am obviously talking about 1v1s, no idea if it is any viable in team games, especially not 3v3s or 4v4s.