Can you guys just stop with this Soviet T4 is crap nonsense?
It got very solid AT option in terms of SU-85 and a solid AI option in terms of Katyusha. The only unit that's somehow strange is SU-76 but that's because of the unit design.
The only reason people don't go T4 is due to call ins being better and more economical option that allows you to save resources and still get very good tanks.
You're getting more for less.
SU85 is extremely bulky, slow and lacks a decent frontal armor to match its slow speed. Btw, its pen values and price are not magnificent if compared with soviet call-ins. When most axis AT power comes from schrecks blobs, you realize that SU85 doesn't do the job at all.
Katyusha is still a RNG arty that sometimes can fail spectacularly even at close range. It's a huge and bulky unit and can be one-shotted and destroyed by everything except small weapon. It isn't useful for dealing with attacking infantry, and the most you can achieve with them is to punish camping players or break havok on a OKW heal truck.
Against no-braindead players, only the first 4 rockets will do damage, while other mobile arty units can concetrate all its fire power in a single barrage.
Su76, no comments.
In resume, going T4 means no AI power, as katyusha fires with unpredected results every 110 seconds
(Hi, Mr.overnerf) and once flanked it will be destroyed without any chance to escape. With axis infantry raping all soviet infantry except shocks, you will need armored AI power, yes or yes.
And SU85 is a microintensive unit unable to kill heavys like Elefant or Jadgtiger, even in packs, due to its slow speed, lack of armor and non-rotatory turret. Moreover, you can't be aggresive with them as they're a terrible flanking unit.
T4 means playing defensively, which is terrible for soviets which rely in being aggressive against the axis better lategame units.
It's much safer to make T34s and make up for its lacking AT power with Mark Vehicle, ZiS and guards.