Hi Blender,
Nigeria's not really like the 10th world, it's a bit like Cote D'Ivoire really. Generally I think the former French colonies seem to be rather better run and more friendly than the former British, Belgian, Spanish and Portuguese colonies (though the present events in Cote D'Ivoire may seem to make a mockery of that statement). One problem that Nigeria has is that it has so many people (about 17% of the entire population of the African continent I believe) and has been ruled by such corrupt leaders for so long that the corruption in society there is deep rooted at all levels. The country is wealthy, but most of that wealth has been stolen from the people by the leaders and sent to foreign banks to fund their extravagant lifestyles. Many of the people are very bright (maybe that's one reason for their success in scams like the '419' scam!) and very friendly. If you wanted to have a look for yourself Bristow and ACN often have vacancies for pilots even if they have none at the mo'. If you already have experience of flying in Africa, but have not been put off by it, I expect they would take your application seriously.
If you go, let us know what you think about the place in comparison to Cote D'Ivoire, Mexico and Central America.