The Japanese attacked the US of course, sealing Germany's fate with a bit of strategy they may have beaten the Russian alone, but two superpowers knocking on their door... although it was a good start to fight, but due to bad command and strategy not to mention the amount of recourses wasted through "Banzai" and "Kamikaze" attacks and on top of all that their troops don't have the right weapons for the job
The Italians... well they didn't have a clue what they were doing, I think Africa was where they show just bad they play ball, very bad leadership with bad quality equipment and to add to that I dough the troops had any combat Exp.. But to be fair the Brits had a strategy.
Maybe if Germany had better allies they might of won the war
I think that should do.