Maybe try using it and dont look what people say here ?
I've used it yesterday to see just had bad it is. First hit 8 kills second 10 kills. When i lost it it had 60 something kills. Such a waste of resources!
Panzerwerfer is all about luck if it actually hits a blob or not, because the rockets are spread out in a huge area and don't have such splash as Katyusha. Sometimes you kill several models, often you kill nearly none, but you basically never get to kill a whole squad with it. Unless you killed a lot of models, you don't even have to retreat after being hit by it.
Katyusha was pretty similar to this before patch, but since the rockets all don't come down at once it was at least possible to kill squads with it if the enemy was not retreating immediately because they will get hit then by the other rockets. So while it was also possible here to be unlucky and not hit much before, in the very least you made sure the enemy has to immediately get out of the area, because he will get hit by the following rockets.
Now after the patch, Katyusha will kill whole squads in the first salve, and if you miraculously survived the first volley and actually have something to retreat, you have to be extremely quick to avoid the second volley, and have to stay out of the area until all four volleys are done.
Surely you can see now the discrepancy in the performance, yes?
And to the people who defend the Katyusha with the Stuka performance: Stuka is not nearly as reliable in killing whole squads as the Katyusha is now. It is very well possible to kill squads if you score a perfect hit and ideally the enemy units keep moving into the creeping barrage so they get hit more than once, yes. But you are far from guaranteed to kill whole squads with it. It actually is not even very good at killing static weapons (which it should be primarily be good against in my opinion, not moving units), because they often are spread out with their models and the rockets only land in a narrow straight line.
And then lastly lets not forget that Stuka has a much larger cooldown, is more expensive and OKW is getting a reduced fuel income, so they need to actually have an advantage for their investment. If you make all other factions units perform as good as OKW units for same fuel investment, then there is no justification anymore for the massively reduced fuel income of OKW.
The balance between Panzerwerfer, Stuka and Katyusha is now a single mess.