Was it as bad as Simon bar Kokhba's judgment calls? I would say HIS calls were the worst in history lol, and Jewish people think he's the Messiah. Adolf's friends bit down on cyanide, Simon's friends got flayed alive.
Yes, Hitler made many much more disastrous decisions than he did, including invading Russia and declaring war on America(who had only declared war on Japan). Hitler made the war double unwinnable for his people out of pure ignorance.
The scope of these disasters is not comparable, look at the death tolls of the peoples involved in both cases...