Do you read reviews before picking a restaurant, staying at a B & B, choosing a hotel, etc?
Do you write a review after you have been somewhere?
Reviews can be valuable...if you know how to use them. Reading one good review followed by 20 bad ones about a place doesn't really mean it's the best place. I would keep looking. But reading 20 good ones and one bad one about some place...I would give it a chance.
It all depends on how comfortable you are reading reviews and paying attention to what is said in them. How do you do it?