Prime Air Services leases Learjets from a German company. They have european crews flying those aircrafts around. If they are that bad, i'm sure the germans who have withdrawn their aircrafts. The Legacy is a managed aircraft, they are crewing on behalf of the owners.
If you're interested in a job, go for it. If you're more into the "lifestyle" thingy, nigeria is not for you. You will be paid, given a rotation and accomodated while there. On your off time, your can fulfill your lifestyle desires. Arik Air is a local company that employs expats from all over, some there upward of 5yrs. I'm sure they have other choices, but have made nigeria work for them.
The ball is in your court. Making your decisions based on unknown folks advice off the internet, well, is your choice. Go, look and determine what you can make of it.