I'm rocking with windows 8 on my rMBP. I've not jabbed my display yetHorrible. I abhor jabbing at my pc screen with a finger. That's why we have trackpads and mice.
I've all but disabled the metro interface with Start8 by StarDock.
I'm not sure what will happen if I were to get the SP3, which is both a laptop and a tablet and the live tiles do have some usefulness.