Lagos was the place that airline managers were sent to when their offences were too bad for them to be sacked or disciplined.
The only good thing about the major cities at least, is that most of the criminals aren't there, having taken up residence in places where life is easier for them, such as Johannesburg, the UK and Holland, although they must be in every country in the world.
That said, I have met some delightful Nigerians, and a friend of mine has lived there as an ex-pat for many years and loves it, but even he has to 'escape' every few months.