There was the recent election that was absolutely 100% definitely not rigged in any way, and all three contenders for the leadership position being listed in the Panama papers or otherwise found guilty of financial crimes.

Gerrymandering is rampant, with states being set up based on political affiliation rather then population.

The oil and mineral wealth of the nation, that which isn't stolen by western corporations, is frivolously squandered by the elite.

Ultimately Nigeria, while a beautiful country full of wonderful people, seems to me a perfect representation of all the issues with western style democracies in general.

Chinua Achebe wrote a fascinating book about the Nigerian Civil War (the Biafran war) that very suscintly places the blame of the civil war (and the resulting later corruption problems) on deliberate actions taken by the British authorities when they "withdrew" from their former colony.