You have to keep in mind that the land mattress shoots its rockets against Germans which have a very different play style in order to keep themselves in the game in comparison to the Allies.
USF and SOV are front line factions that have good/large squads that deal good damage which is needed against the superior German MG42. They have fast and mobile tanks that can move to different parts of the map very fast. UKF is very static but has brace to stand against Panzerwerfers and Stuka zu Fuß.
Germans (especially) Ost rely on their superior weapon teams. The PaK40 is the best PaK in the game, the MG42 is the best MG (on par with the Vickers IMO). These both units are the backbone of the German forces and a Land Mattress simply roasts them with a single barrage. You kill the two PaKs the Ost player has and the chance is high that he can't do anything against your tanks, because the P4 is weaker than your Cromwell and the StuG is easily circled without PaK support. Panther comes too late. The huge area of effect and the many rockets of the LM makes it hard to miss the support weapons.
OKW on the other hand suffers in general against UKF because it was designed to be a faction that has its headquarters on the front. With an OKW medic HQ, which is needed against UKF in team games because of LeIGs to fight all the Allied artillery stuff, it is easy to wipe whole squads as UKF if you know where the HQ is positioned. The land mattress denies one of the core mechanics OKW has.
Artillery currently is way too strong. The only artillery pieces balanced are the German mortar and the russian small one IMO. LeFH and the russian one (including B4 which nobody uses) are also okay because they fire huge shells slowly in a large area.
Panzerwerfer and Stuka at least are halftracks that die to a single tank shot (just like the katy). But the Calliope is a tank that does not require any teching and has the armor of a M4 Sherman, meaning it takes about 4 to 5 shots in order to kill it, which you won't achieve unless you have a huge tank army which means you would win the game either way.
+1
u are right with this post. I think it would be a good chance to test things with the LM on the WBP Team.
Why deal one single rocket from the LM so much dmg? one single rocket wipe often easily a Ost 4 model squad... or a team wepoan like the pak or mg. Why?
it is a hand moved unit...so it can´t be to heavy ..so it cant deal dmg like 280mm rockets drom stuka.. (wtf!?)