You sure about that?
The 1917 October “revolution” took the nascent USSR out of the war, but that doesn’t mean that they would not have been dragged back into it. Most of the Stalinist ideas had their birth in Lenin. A continental Second Reich would have been just as expansionist as a Third. Better look up what the Second Reich did in parts of Africa.
That would have left Germany as dominant in Europe (bad). But Hitler and Stalin never could have risen to power (very good).
As for the German colonies, the British navy could blockade them into insignificance whenever the Brits felt like it.
And I plan to test my theory if I can somehow figure out how to build a Mr. Peabody Wayback Machine.