Straw:
That might be accurate for out of the box rules. But I disagree that Joint Strike is a game breaker.
Odds are you are using Joint Strike to kill a massive German fleet in SZ 5 so you stop getting crippled by UBoats. Yes, those things are VERY annoying! Get 10 of them and you’re doing -10 to England, -10 to America and you’ve probably taken all of Africa and Japan has Australia, New Zealand, Madagascar, India, Persia and T-J. That means England’s earning about, uhm, 1 IPC? America’s earning about 28 IPC?
After Joint Strike, England’s at 11 IPC and America’s back to 38 IPC. (Since odds are you can’t land troops AND sink the German fleet.)
Dug-in Defenders are stupid. Though, they are useful in preventing an allied invasion of Japan itself.
Banzai has been pretty effective for me.
Dive-Bombers are just friggin awesome! Attack at 5 or less? Same with Super Battleships, means you almost always score a hit with your bombardments!
Then you add in Inf and Art defending at 3 or less for Germany and amphibious assaults become almost impossible.
In return most of England’s NA’s are worthless and ALL of Russia’s NAs are worthless in a traditional game.