All true. But I still think if you think about Tripadvisor, Google, Yelp, etc, even if there are hundreds or even more comments on a restaurant, hotel, or what have you, you do get a high-level view from the overall ratings. Yes, someone might give it 1 star because they were unlucky enough to have a hung-over guide. But if 99% of the ratings are 4 and 5 stars, you have to figure the odds of having such a guide are low, and most people liked it. So maybe you go for it.