I believe that they are not nearly one of the most corrupt in Africa. One thing is that they are encouraging white farmers from neighboring Rwanda to emigrate to their land and start farms there.
Clearly our knowledge of Africa is at variance.
Nigeria is on the coast of West Africa. "Neighbouring" Ruwanda is nearly three thousand miles away - inland Central Africa. In any case I think the the farmers you mention might have been those invited from Zimbabwe. Given Nigeria's history since independence, once its decayed farming machine becomes well-oiled, productive and profitable, it will be interesting to see how long the whites will be encouraged to stay on.
As for not being corrupt I don't want to go into lengthy detail. Do mentions of "Biafra" and "cement" for instance, chave significance for you? :-)