The size of the front is exactly the reason unlike others i enlist as many allies as possible when playing Germany. Rather then complaining about how horrible minors are, i want every nation i can get on the Soviet border. There is nothing i enjoy more then watching Soviet units rip deep into Persia, Turkey etc... As i run over their western front and Japan gobbles up the east.
Atleast it has become optional. I stopped calling in Allies because the AI is so horribly bad at prioritising. Its just painful to watch the entire soviet armored force tearing up poor Finland while you are driving to Moskow unopposed.