The Americans had their amphibious landing doctrine used in the Pacific Theater, and the Americans and their allies had amphibious landings that were successful in the ETO as well. The logistics, planning, training and resources that went into these operations is extraordinary in order to be successful, and air power is key in this area as well. The Germans would have had to launch amphibious landings in order to win the war in regards to Britain and whatever other areas they could only reach by sea. I don't think the Germans had the logistics, planning, or resources to launch an offensive campaign, fight the type of fighting it took in the Pacific, and win like the Americans did in the Pacific or the Alllies did in the ETO. I can't see the Germans beating back the Japanese hopping island to island like the US did, or launching the massive invasions it took to win Europe back for the Allies. That's why I can't see Germany actually having a shot to win the war due to its lack of logistics, planning and resources.