claaarky - 9:44 am on Feb 12, 2013 (gmt 0)
I think Google would be able to identify many of the number 2 cases. On-site engagement is not the end of the story.
If the visitor goes back to Google and visits another site for the same thing, it suggests the previous site didn't deliver. I think the sites that engage AND deliver will eventually win in the rankings and be able to maintain rankings over the long term.
I can see that a site that doesn't deliver but is able to engage visitors, say, 4 times more than any competing site might win in the rankings purely on engagement, but any site that can do that must have something major going for it which can't be faked (like a great brand name). You can't fool all the people all the time.