At face value, I like the idea of RubyMotion, but I can't help but feel like it's a crutch to avoid picking up a few subtleties in Objective-C. The article even points out that RubyMotion doesn't hide much of the API from you, so in some ways it feels like 6 in one hand, half a dozen in the other. I'm not trying to be a naysayer, but I don't think the barrier to entry is as high as some make out to be.