The main thing that I like about Google Maps reviews is the lack of bias. You rate the any institution and it can only be changed by you. In Almaty there is a local alternative to maps, more detailed, but your reviews are filtered there in favor of the service provider. This is not very good, the user may be deceived by high marks. Therefore, Google maps is the best platform for reviews and ratings of any institutions.
Being a guide of Google maps, I realized that you can not put one low score, just for one omission.
Personally, I give several ratings, for example: for the service, the types of dishes (if I order several, I evaluate each separately) and at the end I calculate the average rating. In my reviews, I write that the place is good, but if the dish is not very good, then the ratings of the dishes reduce the final one.