1. Uber drivers don't make as much as Uber PR claims (based on data Uber provided).
2. Uber the business doesn't seem to be wildly profitable, or at least not in a defendable way (based partly on data Uber provided).
3. The large amount of capital being injected into Uber are not indicators of growing real value, but instead indicators of a weaker-than-acknowledged business.
It's possible for all of the above to be true but for drivers and riders to both be very happy with the service. Especially since UberX seems to be offering rides for below market prices but the drivers are getting switching bonuses and per-hour guarantees (see elsewhere in this thread).