Uber is showing huge growth by expanding in a lot of new markets (in Europe and Asia). Market formation is expensive; they initially support a critical mass of drivers with minimum guaranteed earnings before mass adoption in that region happens. As long as they can prove profitability in established regions such as New York City, I don't see a problem with them temporarily losing money on expansion.

At the end of the day, Uber is still a private company. There's very few data flying around, and key metrics are shared just with the original investor group. It's hard to judge if they made a correct capital allocation decision or not. And, ultimately, it's their money and their decision to make. Who are we to judge?