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If you listen to Marco's podcast, he'll occasionally say something like "I want to talk about this topic but Siracusa just talked about it on his podcast and did a great job so I'll be quick about it."

It think this review-review is Marco's way of saying that he knows he's expected to comment on the new OSX and everyone should just go read Siracusa's review. Plus it was funny.

edit: typo

It's also self-parody of Marco's exhaustively researched reviews - which are often focused on relatively mundane things like LED light bulbs, thermostats, and coffee gadgets.

I don't think it's parodying the use of metrics, it's parodying the extreme attention to detail.

No, it's a quite serious (and quite good) review. Marco Arment is only teasing Siracusa.