In the hierarchy of UP units in the game, the LefH and werfer are far from the bottom of the list.
Far, far below them lie the ilk of Irregulars. Units without so much as a hope of being useful.
The LefH can do well over a long period of time and the werfer is the best chance of squad wipes of any rocket arty if you're willing to make use of terrain and get it snug and cozy to its target. Are they stellar? No. Are they the worst? Not even close.
I can agree on Irregulars being shit.
However: If Irregulars are shit, you can still go with guards or Shocks instead. This is not nice and makes the commander borderline useless. This can´t be intended.
But: 105s being weak, meh at best and the Panzerwerfer being incapable of leading a long range artillery strike effectively means that while the Soviets suffer from one commander being useless,
Ostheer has no viable lategame artillery at all.
A commander being useless and some infantry being useless whose role can be replaced by another unit is much less crippling than a whole branch of your army being ineffective.