Snakenobi,
You said a lot of things can be mentioned there could be found in many other's life. Can you show some like-instances?
Slavery and racism were prevalent among non-muslims until one-two centuries ago (racism still exist). But Muhammad pbuh cancelled slavery and no muslim ever practiced that afterwards.
If bravery does not mean great, then what? We are talking about rulers here. So, bravery is one of the key elements here.
His achievements were not for the few decades he ruled but lasted many years after his death. Muslims ruled Spain over 800 years, in Indian subcontinent for 800 years, Turkey had a great run in conquering... But I don't go for the detail in that. The point is that, his influence ran through several generations after his death.
