Of course, no one in their right mind thinks that Hitler was "right" in any serious way, especially not about the Holocaust.
What I think about Hitler is that he clearly had something wrong with him. It cannot possibly be normal to be that filled with hate, even given how bad off Germany was. But I do not know that he was actually crazy.
Hitler was "right" in the sense that he knew very well how to get the German people to follow him. But that does not mean that anything that he did was morally right.
Being the child of Holocaust survivors I find it easy to just state that Hitler was evil. However, as evil as I feel that his ideals were, he also was a very intelligent man. He was aware that human beings were more apt to join as a group when united in hatred verses love. After World War I, Germany was left in an economic crisis. Hitler was aware that many Germans were angry that while they had fought in the war, Jewish people had profited in business. He did not bring up the fact that many men, such as my Jewish grandfather, also fought in the war on the side of the Germans.
Hitler created work programs for the Germans, arranged vacations and respite for people who had never experienced such things, and even had a program that provided in-home daycare as well as other types of help. He hired engineers to design and build the autobahn. Hitler had high ideals for Germany but at the expense of other countries and the lives of Jews, Jehovah Witnesses, Gypsies, the disabled, and many other people he saw fit to include as the undesirable of Germany.
Hitler's idea of a superior race was not even that far fetched, but he wanted to attain it at the expense of millions of lives of innocent people. There is nothing right when it involves the punishment and deaths of innocent people.