I make sure to ask every single new driver about their experience with Uber and I have heard positive things across the board, save for a few minor complaints (usually about how the cut drivers get aren't that much higher than what they'd get at a traditional cab company). Most say they love it, many say they make extra cash using it on their off-times, and some say they have entire fleets running on Uber. Overall, from my experience, the drivers love and rely on it too.
I think the secret to their success is that they've simplified and streamlined the process elegantly for both drivers and passengers. A few taps and I'm on my way without worry of if I'll even get a cab (although, to be fair, it is at times difficult to find Uber cabs in Brooklyn), and whether I brought cash/credit. But what's really interesting is how they've seemed to simplify the process just enough for drivers. They tell me that everything is provided for them, down to the dashboard mount for the included iPhone. The software itself is simple enough to work and isn't wrought with rules and requirements, and that let's drivers find their own way to make the most out of the software in ways I'm sure the creators didn't expect. For example, one driver actually ended my trip early while I was still in the car, meaning I got charged less, because he didn't want to miss any potential pickups waiting for him at my destination, which I thought was a clever trick.
My point is that Uber is providing a service that both drivers and passengers seem to universally love. No one, as to my knowledge, is getting screwed for the benefit of another. That's why all these lawsuits seem like desperate attempts to take down a company whose service they know is better on all fronts.