It's all about framing though isn't it? If Uber were '1 (miserably below expectations) .. 3 (met expectations) .. 5 (above and beyond)', you wouldn't see that.

It doesn't really matter as long as everyone's on the same page I suppose. Sure, you clip stuff off the end.. but doesn't everyone just want a taxi that gets them A-B without problem? Who's actively seeking 'above and beyond'? Maybe 'would've scored >5 if I had them' is not a problem, because nobody cares?

(I should maybe say I've never actually used Uber!)