Here is what the Stuka actually is :
- - a very expensive rocket artillery
- - in a fuel-starved faction (let's not compensate the fuel cost, but rather say it can never be spammed and having a Stuka DOES significantly reduce a player's ability to field armour)
- - with the longest cooldown in the game
- + has a hard hitting attack
If you are on the receiving end here is what you think it is:
- + a rocket artillery that has a hard hitting attack
Which is why you want it nerfed. After all, that's what a Stuka is for you. The six rockets falling on your support crews.
What do you want it to be able to do for its cost and faction/tier placement?
Alright - nerf it. Remove its advantage. But better be sure to take away some of those minuses as well.