It's not that Africa doesn't have quality, of course there's, but sometimes African writers oeuvre just fall short somehow.
Like my compatroit Achebe for example. Arrow of God, TFA, even No Longer at Ease, are very good works. But A Man of the People isn't as good as the other novels I just listed (it's the same view I shared with Tiganeasca). A Man of the People is just a novel about corruption and failed politicians and their ideologies that's all, no more, no less, nothing extraordinary. That's just the problem. Ayi Kwei Armah is one amazing writer from the continent (I've read Beatuyful One's Aren't Yet Born and Fragments, both beautiful works), but he hadn't written enough works (I don't know if he has written anything notable in this century). Fugard is Africa's finest dramatist after Soyinka (Sizwe Bansi is Dead, Tsotsi are works from his I've read), and Awoonor is fantastic poet (he wrote This Earth, My Brother, a fantastic novel with stream of consciousness technique), Ngugi (who I think lost to Gurnah) has been one of the continent's best intellectuals (A Grain of Wheat, Weep Not Child are the works I've read, haven't seen Wizard of Crow), Aidoo is an amazing dramatist (Our Sister Killjoy and Anowa I've both read), but just like Armah, I'm not sure she has published anything notable for a long time now. There's difficulty in finding works by North-African writers, so I haven't read Al-Koni at all and have only read a book each from Ben Jelloun (This Blinding Absence of Light, one of the continent's best novels IMHO), and El-Sadawwi (Woman at Point Zero). Have also found difficulty on finding Couto (only read Sleepwalking Land, wonderful work). As for Gordimer, I haven't read her (yea I've read July's People, but reading one book from her isn't enough I know). The continent also boast of Angalusa (a writer I would be reading next year, hopefully), Okri (Famished Road, Dangerous Love are amazing works), even Farrah, and there are still writers who I think will have a shot in the next decade, Teju Cole and Adichie and Leila Aboulela. The continent has missed great writers who I think could have been worthy candidates: Brink, Djeber, Albert Memmi, Mohammed Dib, even Fugard and maybe Breytenbach would have been worthy candidates in the past, but I think their chances has long gone. So my friend, I know my continent.
And thanks for mentioning N'Diaye as not African, just checked her bio now.