I'm not so sure if it's the concept of the completo, but the meat I found in Chilean takeaways was absolutely nasty. The best food I had was from this Peruvian restaurant in Vina, which was absolutely amazing.
The way it seemed to be was simple. Vina del Mar: more of a chilled out local place, quieter, nice place to eat. Valparaiso: dirtier and more dangerous but livelier, it's where the party is at. Bars, clubs, etc.
I have a question for Chileans. Before coming, I was told Chileans were shy people, but when I went there, people seemed open to having conversations with a stranger. Maybe it's because I'm foreign, but you guys didn't seem shy.
Also, is it normal in Chilean culture for people to stare? I found it a bit strange when I'd walk down the road, or past a bar or something and I'd have girls legitimately stare at me til it became a bit awkward. In London, even if a girl is interested in you, she'd go out of her way to try and ignore you. Wasn't sure what was going on there.