Sturm is sometimes OP, sometimes not. It's shell is definitely devastating. Once it vets up, it becomes unstoppable, being able to single-handedly stop any sort of push. I don't think I've ever seen it not do complete wipes in it's AOE. Probably the most toxic unit to play against.
Same here.
A friend of mine loves the unit and it is really tough to play against in 2v2. And frustrating.
Especially in longer games when,
it is joined by a King Tiger with armor piercing rounds.
With AP rounds you have an OP tank killer and with the Sturm a glorious wiping machine.
IMO King Tiger, Sturm AND AP rounds do go together too well. In team games that feels pretty OP.
The collision of the projectile with the terrain however - that is a silly mechanic that makes the unit frustrating to play.
My vote goes for: remove AP rounds from the commander and remove this collision mechanic