Ok ok guys, the main problem we would have, If Hitler one the war i think it would certainly depend when he started winning, would Steve Rodgers have met Howard Stark and help become one of the prime Soldiers to win the war against Hitler, the Nazis and the red skull.
Now what happens to these scientists? What happens to Howard Stark?
Now lets say Howard Stark survives the war, I can almost be sure he will have either lost his fortune or sold out mass fabricating weaponry for the Nazi's.
Now fast forward to modern day, And Stark has no money, his son Anthony will not have the funding and billions he does today. He would not have been able to continue his fathers trade of weaponry. This could also mean that the Iron Man project would never have been made as he would not have been kidnapped in Afghanistan. Hell, would the Afghanistan war be even on if Hitler won the war? If not the inspiration for the project would not have been sparked. No Iron Man.
If Howard Stark went on the Nazi side then we could well end up with a Nazi Iron Man in this age. Not good, in my honest opinion.
Without Tony Stark and the first Avenger Captain America, Nick Fury may not have been inspired the Avengers Initiative. And as this war on earth shouldn't affect the realm of Asgard, Thor will still get banished to earth and I would gues not much would change there. When Loki comes to earth to try and enslave the earth with the race of Chitauri, without the Avengers Thor may not be able to win this battle alone.
But I think everyone would rather be ruled by Loki God of mischief then Hitler...
Please don't delete this post, it took me a while to write, and it's relevent to how the world will be different... a fictitious universe, but a universe none the less!