I have a good example where natural linking is the best method to index pages in search engines.

I have spotted a TV commercial where they were promoting free sport on our TV.

Instead of fast food ads for our kids which promote obesity, this site promotes free sports on our TV.

I am all for it, and the first thought that came to my head was to exchange links to these guys.

Natural backlinks at work. What else can I say?

Looks like your SEO at work is really working. Search for Free Sport on Google.com.au and it's first result.

That's why Google chose this as the main factor in their algorithm to determine site importance.

Naturally obtained links could be compared to a business / traffic obtained thru word of mouth advertising which, I think is still the best way to promote yourself or your business.

Most likely links obtained in such a way, are a minority these days. I think as minority Google has no way to detect those links and give them the real true value they deserve.

There is so much spam on the web these days, that no SE can fight it off. Google is probably doing best job

From experience, Google's Algo is not as complex as most people make it out to be. The ol' 80% / 20% rule holds true, with domain age and exact match domain names having a stupid amount of authority.

Yes, naturality should come in SEO otherwise it looks not good.

there are no doubt that we should always go for the natural link building.To me its always unique content that can build backlinks for you automatically.

SEO considers how search engines work and what people search for. Optimizing a website may involve editing its content and HTML and associated coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines.