If Nazi Germany wasn't stopped we would be living in Man in the high castle world where japanese empire rule over asia, Italy over afrika and germany over all the rest with split of americas. It is potentially peaceful and safe world. Just not nice.
It’s not consistent with any of the myriad approaches to international relations either, and quite frankly, how agreeable you find a fictional world order isn’t worth discussing.
If you’re interested in geopolitics reading outside of Philip K. Dick, an accessible but satiating piece I always recommend is World Order: https://www.goodreads.com/book/show/20821140
It’s written by a highly respected war criminal (how many fields can say that!)
