Hitler was a tyrant, a genocidal maniac and a very sick, sick man (as in clinically insane). But he was a man. I wish he had never been born, and am as harsh as everyone should be on his defiling of the human race in general.
But i would not have celebrated the death of the man himself, but rather the death of the Nazi ideology and politics. Dying alone in a basement and shooting oneself in the head is not something I would wish to anyone, not even my worst enemy. Neither would dying in a hospital from a wasting disease. In my opinion, no crime is great enough to wish for the death of anyone as the result of it. But then we start the debate on the death penalty and I shan't start on that