2 I'd say.

Country:
2) Its gov't run, so I would not trust it. Although there are some private enterprises.
3) I don't know, I didn't send a letter in years.
4) Some people says that Correo Argentino is le crap, that they steal you and the service is, like I said before, le crap. I usually get the bills in time, there are few cases of late arrivals of bills (they expire the 10th day and you get it the 8th, 9th or 15th day). As I've heard, there are 27 postmen to cover 250.000 inhabitants. Maybe that delay things, but I'm not really sure.