The Germans did their best. Ultimately, their designs weren't that really good due to a lack of experience and I think Japanese and Italian warships were better. The same could be said about their tanks, where they were inferior to British, French, American and Soviet models. The British, French, and Americans had 20 years of experience when Germany had no experience. Sure Stalin purged his armies but they weren't raped like Germany after World War 1 so they had some experience to make good tanks. Ultimately a lack of experience, German obsession with craftsmanship, overengineering, and the Nazi's own ideology contributed to the German tank's flawsTrue and as a consequence their ships weren't that good. Sorry but I must stress this point a ship (the Hipper the Scharnosts etc) whose machinery fails regularly when pressed doesn't do his job. To sail for months on a end with minimum help from shore against more modern enemies and still do the job and win. That is it.