When i was in Bangalore for sometime i used Uber/Ola a lot and mostly used their pool service. There were times when there were 4 of us who were male and 1 female but i didn't experience any instance where men looked at them in a pervy way or anything. There was a drunk guy too despite that the girl was mostly on her phone.
There will be some of these cases every now & then and hope they're given severe punishment! You can't just say be careful coz nothing in life is guaranteed and in big cities Uber & metro are still the best option for commuting. Female drivers are a good option. But i don't know if they would like to drive at night since these incidents happen at that time itself.