I'm gonna have to second some other guys opinions on this one. The Allies as a whole were generally inexperienced at this point. Especially in America, the armed forces were still trying to get and train enough troops for the war to get to an adequate size. Then you want to send US commanders up against German commanders, some of whom were veteran leaders from three different wars. Many of the arguments that Germany would be knocked on its heels are based on the assumption that Allied fighting power and capability would have been the same as in June of 1944. Aside from the technological aspects and almost complete lack of intelligence about enemy weapons systems, there are a few other factors that I think would have contributed to an undoubted defeat of the Allies.

Additionally, the joint/combined command structure wasn't in place yet. Air power was extremely limited in its effectiveness during the Tunisian campaign because air and ground commanders couldnt get along and properly prioritize missions, among other things. Lets not forget Patton and Montgomery...

It took some years and some good honing of fighting ability to create a C2 structure that would support major joint/combined operations in the air and on the ground - and we didn't have it by this time. The better trained and experienced Axis troops would have crushed an initial landing this early in the game - I'm convinced.

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"The Marines I have seen around the world have the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps!" Eleanor Roosevelt