I found it to be a useful tool to monitor how your daily ratings were. It also gave you a rough idea how individual passengers were rating you. This was really the only way to attempt to adjust daily habits in effort to keep a solid rating. I would suspect they will start deactivating drivers all willy nilly without cause. Just a canned email about how you can improve. My favorite advice was "Don't solicit 5 star ratings." WHO WOULD EVER DO THAT! I have never, ever asked a passenger for a 5 star rating. Another favorite was when a PAX would get out of the car promising you 5 stars like they just dropped a 10 spot on you. "Thanks Mr....those 5 stars pays as many bills as a fart of fairy dust!"
I don't think it is a glitch. For awhile yesterday it showed my overall rating in my 7, 30, and 365 day. Then the format of the page changed and it disappeared completely. You can only see the overall up in the corner.