Consider also that the alternatives are heeding the hotel itself or a booking engine or a travel agent. As was said, if you're going to be influenced by someone, why wouldn't it be someone whose veneer of life you'd at least tangentially followed, someone who might typically have similar interests to you (surfing, outdoors, fine dining, etc). It might be an imperfect filter of the products being offered, but at least there's a non-zero chance that they rejected poor offers or didn't write enthusiastically about the ones they didn't love.

I think it's short sighted to write off some of this.