If the Germans had defeated the Russians, there would have been more German units on the beaches to meet the Normandy Invasion. One of the reasons Normandy was a success is because the Nazis had a large majority of their forces fighting in Russia (Operation Barbarossa began in 1941, D-Day wasn't until 1944). There is a chance those units would have been pushed into the sea. "Fortress Europe" could have become a reality: the Allies might have been willing to sue for peace, letting the Germans keep their territorial holdings. A different Cold War could have then developed between the USA and German-Europe; not to mention the Holocaust would have been able to continue unabated.

The Allies won WWII as a result of the MASSIVE loss of German lives in Russia (The Russians payed an even larger price). Russia won the war just as much as the UK/US did - all of the bitter fighting was in the eastern front (Russia). Taking Russia out of the war would have changed everything: there is no guarantee AT ALL the Allies would have won outright if the Soviet Union had fallen to the Nazi onslaught. Don't diminish the sacrifice of the Red Army in WWII and pretend it would have all worked out if they had just lain their weapons aside.

Your argument really is baseless. Changing a part of history as huge as WWII will not simply eliminate all the bad things about our world, as if it would simply become a utopia. It would have deep and lasting effects, like the real WWII, which would cause hardships, struggles and successes for the people living in the aftermath. What-if history is an exercise in ignorance.