Fundamental challenge with star rating system is your perception of what counts as 5 star & my perception of what counts as 5 can be very different. It basically comes down to what your personal standards of something 5 star are. I am generally a very adjusting person, so minor glitches might not lead me to move from 5 to 2 star but someone could be more particular than me in which case his 5 star will move to 1 star at slightest issue.