Mach and IOKit and and a gazillion other things are hardly "the same old Unix stuff", if you're talking about the kernel. If you're talking about everything above that level, read Amit Singh's book if you really think there are just splashes of superficial changes at and above the POSIX layer. If you have and you still feel this way, I don't know what to tell you. I'm not saying it's all great, but there's a LOT there.
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Mach and IOKit and and a gazillion other things are hardly "the same old Unix stuff", if you're talking about the kernel. If you're talking about everything above that level, read Amit Singh's book if you really think there are just splashes of superficial changes at and above the POSIX layer. If you have and you still feel this way, I don't know what to tell you. I'm not saying it's all great, but there's a LOT there.