I do not find this unit out of control. It rarely gets more than 30 kills in a game (which is saying something because of its high cost) and it requires a bit of skill to use well. If you are struggling with it in team games you can use Kats to bombard it since they have longer range.
The issue here is the extremely potent OKW late game which it synergizes with and makes it nearly impossible for the Allies to do anything. In this case the Stuka is the final nail in the coffin as it wipes vet and allows high vet blobs to roll over the new recruits.
Short: Stuka is not the problem, OKW late game in larger games is still crazy strong.
Bean!!! You traitor!!!