Also, should we consider the fact that most bands in South African write songs in national languages even the music is about the sounds, rhythms and combination of both but the texts also matter to international audiences.
I would personally support that the statement which iss boring but when referring to the above elements, it seems quite reasonable that some might say SA bands suck and even more.
From daily experience, South Africans love their music no matter the reasons and if we look at bands such as 340ml, African Jazz Pioneers, Almost Famous, Babu, Bala Brothers, Baoba Three, Mafikizolo, Malaika, Salsa Candela, Springbok Nude Girls and so many more; we can see that South African music industry growing fast but the only problem is that artists and bands are not well managed and most of them are limited in terms of scenic production.
There a few bands that produce live concerts internationally in great venues such as Madision Square in New York, Bercy and Olympia in Paris, and at other international venues. Perhaps in this context, some might say SA Bands suck but except that, SA bands locally or nationally perform well and keep the audiences alive during scenic productions...
In my point of view, it depends on context to say whether SA Bands suck or not. Who says better?