I've used tripadvisor in the past, usually to check views on a possible hotel, rather than search for one directly.
Did anyone else hear the debate regarding the group action today on radio2? Was really more about the type of stuff they get on tripadvisor and pundits, as well as some hoteliers, suggesting (as we all know with pub review sites) to take an overall view & not be swayed by some troll going against the general flow. The first telephone guest (hotelier) spoke about action he was taking against a tripadvisor reviewer, rather than the site, so he had managed to identify a defamatory culprit from his end.
Following talk of national PG exposure earlier this week, I was almost tempted to phone in to explain the pitfalls of unmoderated sites, and the benefits of well regulated ones...