After having lived in Athens for 6 months I thought that the worst public transport was there. But!!! Not according to me, according to other people on internet.
Guys! Try local trains Circumvesuviana in Naples!!! IT IS TERRIBLE. No schedule for the trains, no screen information, very messy mean of the public transport. It is really bad.
So, in my opinion, the first day impression from Naples, the difference between Greece and South Italy is that in Greece there are no rules and not much symptoms of modern civilisation, like ticket control etc. In Italy it is absolutely the same mess, but multiplied on something that is called modern civilisation infrastructure. As a result, it doesn’t work at all. I don’t see public transport in Nea Polis at all.