I am generally very cool with disruption and specifically with Uber/Lyft etc disrupting taxi services.
One issue I lock onto with taxi services pretty much around the world is that many governments aggressively constrained issuing of taxi licences/medallians etc (name varies from jurisdiction to jurisdiction) and essentially turned licences into rapidly appreciating ponzi currency. The Uber/Lyft model shows that this was unnecessary. This is a mess governments created because they saw easy money from it and now they should clean up.
But my problem specifically with Uber is that they are amoral arseholes and arseholes to pretty much anyone if it furthers their perceived interests. And hypocrites. Their attempt to use court system to regulate the formation of a drivers union is anti-libertarian. Like many libertarian endeavours they pay lip-service to core libertarian principals only when it suits them and then happily apply judicial/regulatory mechanisms when it suits. There is no real unifying principal at work other than do whatever it takes to get the things we want.
Further, what they want goes way beyond merely disrupting taxi services, their end game is to monopolise all private transportation and given their corporate culture no good can come from this end game.