I used Uber several times in Bali last month without significant issues. The one issue I had involved the app correctly identifying my present location. When ordering an Uber from the Sheraton Kuta, the app insisted I was at the mall next door. Each time I had to fix the departure location. When I was at a bar, the app insisted I was a block away, which I didn't realize. I watched the car drive by me on the app and on the street. The driver called me, I waved, he saw me and picked me up.