@USS:
I would like to add that I haven’t played without National Objectives so maybe my advice means nothing. The US benefits from NOs a lot, so maybe that will help the Allies?
Actually, the allies lose their National Objectives quickly, whilst the Axis attain (and keep) theirs. This makes playing with National Objectives more advantages to the axis.
Overall, no NOs means IPC income is less for all involved. Units are more valuable, especially reusable ones (like planes and transports). Once the allies make this initial investment(s) in these type of units and does not lose them, the can have a fighting chance in the game.