Ariel, I agree that some African weapons are 'exotic' looking and that a lot of them would only be used for ceremonial reasons. But bear in mind that most of these 'ceremonial' pieces were developped from the real thing.
Anyway, some African weapons were and are the real thing.
My favourite piece (and I wouldn't be very happy if I received a blow from it)

:
Here's another one : a Shi-sword with a thick and rasor-sharp blade.