[carlossouza]

I'm not a psychologist, but I'm sure one can explain this insight:

Whenever I'm rating an Uber (or any service), the number of stars I leave is often more correlated with how I feel at that particular moment (regardless of the service) and less with the service itself

If I'm having a good day or in a particularly good mood, everything is 5 stars, regardless of the service... and vice-versa

[carlosjobim]

That's why people give horrible reviews for their hotel on Booking.com if it rained when they were holidaying, and vice versa.