(1) I'd rather the aggregate recommendations of a million people than the personal opinion of just one in most of these situations - you want the statistical mean experience, because a travel agent can be given special treatment or just have had a lucky streak placing clients in an otherwise seedy place.
(3) Hopefully another thing tech can fix. I mean, yeah, you have the rare extremely special case circumstance you can't easily break down into a power search, so they have a niche, but as a general tool for people looking for places to stay, you really don't need another fleshy body directly involved with the seeker.