I've been playing with it for a week or two and I like it quite a bit. Naturally there are things that are wrong with it and things that are right. I don't want to rehash the things that others are whining about much so I won't.
The only problem I have had with it as a player is when I'm playing the Nintendo 64 emulator and playing Mario 64. The analog stick doesn't always register in the center so Mario tends to do that tiptoe thing like the stick is off center a tiny bit. That's about it. I think that is a hardware problem and not the emulator developer's fault. I've mitigated that a little bit by calibrating that stick slightly off center in the direction Mario try's to walk. This is done buy removing the batteries and putting them back in with the stick where you want center to be. I've had no problems with controller or sound delay like I have heard and my buttons have never stuck.
As a developer, not one of my games that have hardware acceleration have worked out of the box. I have not tracked down the problem so I don't know if I am using too many bitmaps, the hardware accelerator library is incompatible, or my file access is wonky. Of course I will track it down since I've spent the money already and I want to release my metroidvania clone on Ouya.
I hate the name Ouya and I find it irritating to say and hear, but that means almost nothing. I love the fact that I can put it to sleep from the controller. So I can walk up, push the power button on the controller, Ouya wakes up and can be playing Mario in a few seconds. If I need to leave, I double tap the power button and put it back to sleep. Yet another few seconds and I can walk away knowing my game is saved- mid-jump if I so desire!
Of course the game selection is limited as could be expected, some games are cool and some games suck. I am eager to get some of my games on there as couple of them would benefit greatly from having a controller- some of my games are cool and some of them suck so they'll fit in nicely!
I believe I will review a few Ouya games on UnkAnd.com in the near future after I tire of Mario.
Over all I'm very pleased with my purchase and I find myself messing with it almost everyday- sometimes for hours, sometimes just a few minutes.