As an UM user: I completely disagree. I think it's got a solid foundation, but they should have never marked it as production ready. If they had baked it a bit more, it could have been.
I disagree. I think if it was marketed as heavily as google markets android it could compete in certain markets like power-users and professionals.
It could carve out a niche, but it would never compete. They don't have the money Google has by a vast longshot.