One of my relatives was a French dude, who watched the Americans arrive, and shouted "Queekly, hide ze tzcheeeese!". 'Cause, you know, Germans don't eat that much cheese.
"Zey weel use it in zer hampoorgers!"
No, no it isn't. It still is the largest-scaled assault in history, and from the sea no less.D-Day is highly overrated.
And the reason so many Russians died, is simply because their lives weren't defended as fervently as Americans' or Brits' lives were. Soldiers were thrown into impossible situations, left to starve, not given enough armament\equipment, etc, all due to the communist rule's stance on such matters (the phrase 'everything for Mama Russia' comes to mind). But, yes, Russia's effort in the war was a great one, and Germany's assault on it in... 1942, was it, was a great step towards the defeat of Germany.
