I flew Air Zimbabwe last fall, without incident. It was a short flight (Windhoek Botswana to Victoria Falls -- barely one hour), so it's not comparable to a flight from Europe to Africa.
But I laughed at the previous description of Mugabe's travels with the airline. I was told by two separate people in Zimbabwe tourism that the airline's schedules could not be trusted because the president would frequently "borrow" one of the planes for government (or private?), business and flights would be cancelled with only a few hours' notice.
Guess that's what they call a dictatorship!