Being a student I'm really tempted by the light weight of the rMB, but unlike the MBA which was a portable lightweight do-it-all laptop (well, for me), the rMB really does feel like a compromise. (for me... right now...) I'd be happy to be proven wrong, but please answer my concerns rather than telling me I'm wrong just because it works for you.
* Are you bothered by the one port? We have our fair share of presentations where the video-port is needed to show Powerpoints. It's not like we have AppleTVs laying around at Uni, so an adapter would be needed. Seeing as I always forgot/lost the Mini-DVI adapters to my old white MacBook back in High-school I don't think I could live with needing to bring the video adapter. First of all I'd forget it, then next time I'd lose it and it would cost me $79 to replace. The MBA needed the adapter, but at least it was cheap.
* Do you ever feel restrained by the battery-life? I've heard 6-7 hours is basically what you get. Far from the 9 hours claimed. I get 10 hours no problems on my rMBP and I love not having to bring a charger.
* Performance? Some people claim that the rMB can cope with coding apps, websites, photo editing and even slight video editing, whereas others state that the rMB is lagging like crazy even working with spreadsheets in Excel or using mission control? I really wonder what the deal is, are people having such high expectations that they are surprised at some slowdowns in Excel at times, or are people trying to rationalize their $1500 purchase by saying that its faster than their old rMBPs...?
* Build-quality? Squeaks and rattles seem not to rare here on the forums. How does it compare to the rMBP? My old MBA used to squeak from the bottom plate. Two (!) demo rMB models has broken at my local Apple reseller, and the employees recommended I wait for Rev. B.
Yes, I am one of those who hoped for a retina MacBook Air... (You probably hate us!

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* rMB feels like a compromise, as I said, compared to the MBA.
* My rMBP is slightly thick and heavy at times (I'm not comparing it with a 2007 MacBook, as I'm coming from the MBA).