I find this list a bit too biased.
There is only 1 German unit and 7 allied units.
You know, axis also have units that are rarely played.
Panzerwerfer, Brummbär, SdkfZ Uhu, Flame HT, OKW P4, etc...
And on the other hand the listed units are likely not useless at all.
DshK is a better Maxim which fits perfectly in Sov T1 play.
Partisans spawn in buildings and can finish any heavy injured vehicle.
Echelons are not meant to be frontline infantry units and though are strong with bazookas.
Just saying that this poll actually means nothing and additionaly it seems to represent only one side of the game.
Dishk is a cop out if you are not going T2, and even then I would not get them. Dishk suffers from all the same problems a maxim has with only some more damage and penetration which isnt very effective for all that extra manpower.
I agree with your Partisans point, I feel they are no where near as bad as the SU-76

I also agree with your rear echelon point.
However I do not agree with your list of axis things to place on the list considering none of what you listed actually struggle with what they are intended to do. They may be overshadowed by other units, and not used a whole lot, but none of them are utterly usless