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Review of MacRuby: The Definitive Guide powered by the Slant community.
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Con Outdated - Material is no longer very relevant.
MacRuby is not the best introduction to the Ruby language, as it was meant as an introduction to MacRuby which is an implementation of Ruby 1.9 on top of the native Objective-C runtime and CoreFoundation framework of OSX - and is not just the RUby language itself.
Furthermore, wiith the recent dump of Objective-C by Apple, most of the libraries that MacRuby was built on top of no longer exist in OSX distributions, so the project is effectively outdated. Refer to the referenced Readme on their Github project for more information.