Gokkel started with OKW
http://www.coh2.org/topic/23463/okw-commander-evaluation
Austerlitz did OKH
http://www.coh2.org/topic/23503/wehrmacht-commander-evaluation
Here is my take on the Soviets.
I am mostly a team player game so mostly writing with that in mind:
Guard Motor Co-ordination Common
For a long time this was one of THE doctrines, especially during the Era of the Unnerfed Tiger Ace. It remains a solid choice for anyone struggling against German Armour and greatly complements a T1/T4 build. It's main weakness is a lack of off map call ins, but with guards and Mark Target there are plenty of other good things to spend munitions on.
Guards
Best seen as light at support troops with some AI capacity and pretty much eaten by OKW infantry.
However they are a threat to their light armour such as Luchs and pumas.
Because they are not so common button is often unexpected and so smoke unavailable as such it can be an unwelcome surprise that will ruin someone's day.
120mm Mortar
Nice base truck you have there, shame if anything were to happen to it
Vehicle Repair
Meh
Mark Target
See that heavy armour? It's dead. Excellent for throwing into a fight you aren't even in which makes it a call in in all but name
2 x T34/85
Handy, powerful and hard hitting. Use these to give offensive punch to an SU-85 build or hold off to 10CP for the win
Guard Motor Combined Arms Common
Not highly favoured, but on the right map against the right opponent, useful
Hit the dirt
I'm going to lay still and get mortared and grenaded to bits
Pass
Guards
PPSH
If you can get close up, which makes this map dependent, this can help scale conscripts into the late game
152mm Howitzer
Fixed artillery is not so sexy, but OKW give juicy targets
23mm strafe
It's ok
NKVD Rifle Disruption
Considered a joke because you get no units, but has some niche abilities
Radio Intercept
Because knowing is half the battle
Recon
Nothing with recon is terrible
Fear Propaganda Artilery
Generally it is better to kill than pin then retreat. But it does stop capping and that's occasionally useful, and it is cheapish. And on a big map with restricted mobility (like Hill 331) it's a long walk back to the fight for OKH who cannot set up forward retreat units
Rapid Conscription
I don't use any of the munitions to manpower if you get killed abilities
23mm Strafe
Shock Motor Heavy
ISU-152 is not the god unit anymore but it is still pretty good and this commander gives you up close infantry and death from afar.
Shock Troops
Get close and go toe to toe with elite OKW infantry, but too many will drain MP like no tomorrow
Armoured Vehicle Detection
Never used this and I don't feel I am missing out
Conscript Repair
If you still have conscripts by the time this comes out, maybe situationally useful
IL-2 Bombstrike
BOOM
ISU-152
Wah! My vetted infantry got wiped!
Axis players hate this unit and will try to kill it with extreme prejudice, don't buy it if you can't protect it
Later