No don't get me wrong, the Ouya surprised me in terms of interface, ect.. the thing is, if a lot of ouya specific games aren't produced, you'll have the issue of a lot of games just not supporting the controller properly, which seems to be a universal android problem.
This is second hand knowledge, I don't have one of these personally so take it as you will, but:
The reason that the included gamepad looks like a ps3 controller is because it IS a knock-off ps3 controller. Ps3 controllers and Wiimotes are both Bluetooth devices, so they've had good luck getting them to work in android. Usually if a good firmware is put on the device, they'll support these controllers, as well as a wired 360 controller, natively. Now for the games, much like the ouya, support varies. Worst case scenario there are resident apps that make a bluethooth gamepad show up as a keyboard/mouse combo, which is pretty much universally supported. Of course with that trickery you loose some functionality, but it's better than nothing.
I agree btw that the quality of a lot of these devices isn't stellar, but then again you often pay 1/4th the price that you would anywhere else so it isn't that bad a trade off in a lot of cases.