The amount of supernatural abilities in Heroes and the 4400 also increased after season one, but we all knew it would happen. I don't think that Lost would have worked well if it was full-on from the start. It was meant to keep us guessing and stay open to all sorts of ideas in season one, and help us learn more about the survivors than it was to tell us about the island. It's supposed to go something like this, I understand...

1. Learn about Survivors.
2. Learn about Others.
3. Learn about [??? - possibly what is going on off the island?]
4. Learn about [???]
5. Learn about [???]
6. Learn about [???]

So I figure that learning about the biggest mysteries of the island will happen in the last season. Until then, we'll just have to guess at exactly how supernatural each thing is.