I’ve just posted two videos that review the statistics around very common openers for both Germany and Japan in Axis and Allies Classic (MB 2nd Edition):
Germany: https://www.youtube.com/watch?v=TG55y5vyyqQ&t=101s
Japan (and why you shouldn’t attack that fleet around Hawaii): https://www.youtube.com/watch?v=bQ48LJurAhU&t=8s