Exactly. The problem with this and MacRuby is you're only really using the Ruby syntax. The idioms are still mostly the same, which IMO is what makes Ruby shine, not necessarily just the syntax.
But you're not STUCK with that. You can write wrappers. Look at HotCocoa: that's Cocoa code that looks like Ruby.
Even outside of that, though, there are a LOT of things that you can do with MacRuby a lot cleaner thanks to it being Ruby over its Objective-C counterpart. Try launching an external process, for example. It's 5-8 lines of code at the very least in Objective-C (and it's not as flexible), whereas it's 1-3 easy to read lines in Ruby, depending on how much control and feedback you want.
I think as it matures, we'll see some wrappers that will make MobiRuby closer to what people are wanting to see from a Ruby-on-iOS solution; it's weird that you guys seem to have no vision for this sort of thing.
