A big question that guided my thinking on visits to these countries for the BBC was - "How do these countries actually feel on the ground, compared to my own expectations and the general consensus of opinion?"
When expectations are low - as one might generally say about Nigeria for example (although not in recent years among specialist investors in Africa) - it is easier to be positively surprised.
But the opposite is also true - and this could be a problem for Mexico, which financial investors are really quite excited about.
I returned from my travels thinking it won't be so difficult for Nigeria and Turkey to positively surprise people, as many put far too much weight on the negative issues that are well-known - crime and corruption in Nigeria, for example, or heavy-handed government in Turkey.