It's an awful way to program. You don't get a choice of languages. There's no debugger. There isn't even an easily accessible console log to print to. It's like trying to assemble a watch, in the dark, while wearing mittens. You can do it, but it's not terribly fun.
There's a reason that there was a massive developer outcry at the "sweet solution" of HTML5 apps, causing Apple to release a native SDK instead.
