As one who has lived in South Africa (and has had family there for non-stop for 180 years) I am not in the least bit surprised that the ground markings are so poor, the taxiways confusing and warning signs lacking.
Paxbox, are you just another ex-South African having to shoot the country down to justify your decision to leave?
I have been lucky to travel far and wide and can say that South Africa's airports are of world class quality - especially Cape Town and JNB. Of course, I can't speak for the signage issue, but it is quite amazing that every year, hundreds of thousands of flights depart from that runway and in that time, only once did a 747 make it down Mike to clip a 60 year old building.
Please direct your misguided bitterness elsewhere.