Besides gimmicky FHQ, the rest plain suck.
NKVD - Nothing with recon totally sucks
Radio Intercept no one cared about but suddenly became OP when Advanced Warfare got it
Propoganda is a lot better on larger maps, and sometimes the ability to force a retreat is better than damage
Conscript Support
- Early to mid Game advantage only
Seems to me this is intended for 1v1 only
Armoured Assault
Late game power, but the T34/85 and IS2 too close now
Reserves
There was a point when Irregulars were almost the best soviet Infantry
Not popular now though
Urban Defence
As noted very good on closely stacked Urban maps (Angermunda, Ettenbruck)
Partisans
A lot of fun in the right hands and have the ability to tip battles your own forces are nowhere near
Soviet Industry
Popular still, but hard to get right now
Defensive Commander
Outside high starting resource starts on Urban Maps this is pretty rubbish
Thing is though, the bar for what is useful has been raised
In a team of 4 Sov you could pick one of the niche commanders, now there is the US
1) A lot of the Sov Commander Meta is covering the holes in the US Structure (late game tanks)
And that is much more important than getting a fringe commander especially when you will only have 2 Sov players on average in a 4v4
2) Having the US is better than a niche Sov commander and better also at certain things (if I want to ConSpam I can take a doctrine that supports that, or I can just play US and RifleSpam - which is better)