I don't really buy that because its possible that the guide causes people to have high expectations and when they don't have a good experience they might blame

I don't really buy that because its possible that the guide causes people to have high expectations and when they don't have a good experience they might blame circumstance or their own taste rather than the restaurant because the authoritative book couldn't be wrong could it? I was also reading in another article posted in the comments about how receiving a star can be life-changing to restaurants and it forces them to maintain the same level of quality, so the award causes positive feedback.