Good Day Kamaraden!
I have been struggling to deal many things some of which are: USF rifle blobs, Penal blobs, Late game T-34/85 and T-34/76 spam, and ridiculous spam of Katyushas and Calliope or Callipsos as I like to call them.
I think you are right in the sense that you need a lot of micro as Ostheer, maybe more than for other factions because of your reliance on team weapons. You constantly have to re-position your team weapons so they dont get flanked/artied to death.
Then you have to consider this: if an enemy loses a squad of - lets say - Rifle Men, he loses one squad. If you lose an MG42 to the enemy, you not only lose a squad, but the enemy effectively gains one. I think thats the largest weakness of Wehrmacht, the reliance on team weapons, which often will be used against you. And once a Soviet player gets a 6-man MG42 to back up his Penal hordes, it's pretty much gg. So, in team games you really have to work together with your mate to protect your team weapons.