The battle performance of the Hitler Jugend is well attested. Major General Charles Foulkes, commander of the 2nd Canadian Infantry Division, who encountered the 12 SS Division at Caen and Falaise, stated "...we found that when we bumped into battle-experienced German troops we were no match for them."
Read the accounts by Zetterling or Max Hastings of the Battle of Normandy.
Another key indicator is that although German troops underwent far more severe bombardment that Allied troops, they showed far lower incidence of combat fatigue.
Facts win out over offended national pride unfortunately.
As for the comment about the Poles, the Dupuy institute has shown that the Germans had a combat efficiency against them of 1.7. This is despite the fact that the bulk of the German Army had minimal training and nearly half the men were aged 40+.
You’re missing the point. The combat performance of individual soldiers isn’t the deciding factor in who wins a war. This is real life, not Call of Duty—the KDR of German soldiers is mostly irrelevant. And even if it weren’t, as others in this thread have pointed out, Germany wouldn’t be fielding all Hitler Jugend divisions all the time (or even at all, at first).
Not to mention that by this point the Final Solution would likely be well underway, drawing critical resources away from the war effort at a time when Germany won’t have much to spare to begin with.
It wouldn’t be long before superior Allied economic performance, industrial capacity (especially if the US joins the war), logistics, and military organization will all begin to tell against the Nazis.