This paper studies some factors responsible for Nigeria’s Poor Management Leadership Quality Generally and the Poor Leadership in the Management of the ECOMOG Peace Support Operations in Liberia 1990-1999. The paper is a result of a combined research efforts conducted on some factors responsible for Nigeria’s poor management leadership quality and the analysis of External and Internal Factors that Impacted the Effectiveness of Nigerian Political Leaders in ECOMOG Peace Support Operation in Liberia from 1990 to 1999 and a detailed review of late Professor Claude Ake’s thoughts on African leadership and its Political Economy. The thoughts of O.J. Dada on Nigeria on these issues are also reviewed in some details and a few examples of poor management or outright mismanagement are equally analyzed at the end of the paper. A brief review of factors impacting the effectiveness of Nigerian political leaders management skills in domestic and international affairs indicate that the key factors are external influence of the OECD countries who fund the Bretton Woods institutions responsible for providing the African post-independent development agenda, the internal political conditions which are heavily impacted by the colonial legacy which emphasizes power retention to the detriment of development programs [1] and brought about poor leadership management skills which finally resulted into the tendency to be corrupt [2]. Most of the scholars and other political commentators on African political economy agree that external factors affect the economic development of the continent just like internal factors. The internal factors are concerned mostly with the qualities of the political leadership which is negatively impacted by incompetence, mismanagement and outright corruption [2]. Research conducted for this paper revealed that the ECOWAS desk officer in Nigerian Ministry of Foreign Affairs complained about some dishonest military officers who absconded with millions of dollars meant for the peacekeepers in the Nigerian ECOMOG contingents in Liberia from 1990 to 1999 [3].