While I agree with you about AirBnb, I think Uber is still doing a good thing and improved the way I use taxi/limo services, gone are the days where I have to guess how much the trip will cost or if I can make it in time to destination without calling at least couple limo companies or being screwed up by a driver in a city I visit for a first time.

Uber use of technology is what I think separates it from airbnb and even tho they are burning investors cash they at least doing something great to improve customer experience.