I bought one to export my game to. My game didn't work on it, which makes the system almost useless.
Wait... What did you expect? If you wrote the engine yourself, you should expect there to be some porting pains. If you're using an engine like Unity and its export feature, you should expect that it's not going to just work without intervention on a brand-new platform.
And that maybe makes it 'disappointing', but not 'useless'.
True. However, the console also has other problems. No on/off button, a couple games on the store didn't work correctly, and yet others were buggy. Expect a tablet experience or worse.
Had it not been for these problems, I would have completely forgiven the problems I faced.