It's the mechanized commander, it's based on mobility. With this he'll sacrifice firepower and capping power. Sturms at close range will deal with it pretty quickly if you can get them there. Actually even at range they kick it's ass. Since they sacrifice capping power, use it to cap yourself and make bigger groups of units to counter it's low firepower and make it run away.
in short:
-bigger groups of units (like 2 volks or 2 gren)
-cap cap cap while he can't
-Sturms win if it carries no one
-Fausts
It's also great to flank MGs so be carefull if you plan on spaming MGs against it with no support.
Worthless advice is worthless. im not playing on your level. where i come from they support their dodge and go straight for the cutoff points. you cannot cap as your volks are fighting the rifles and dodge. and they will lose 99& of the time because this combination is to much for any early game volks+pio's safe for cowering into buildings and losing map control.
And 2 pio only work if he is not supporting the dodge.
Making wc51 1cp will kill mechanized doc.
No it will make it balanced. and its far from a bad doctrine. its arty is absolutely brutal vs the okw