E.g. if you search for ‘tickets’ then click ‘see all search wiki comments’ at the bottom of page, you can see what other people have been writing about ticketing sites.

I don't think Google would take notice of people’s personal re-rankings or comments within their algorithms right now but it is a cool feature and will be interesting to see how it grows. Could it learn your personal result preferences and start ranking results to be more relevant to the individual?