...It definitely sounds like you were unlucky and you got a faulty notebook. The 13" rMBP has superior performance to the MBA... this is measurable and it is a fact. Personally, I could not get used to the MBA's screen... after ~1 hour of use, my eyes and head were almost always hurting like hell ( considering I spend at least 10-12 hours a day in front of a screen, this was quite a deal-breaker for me... funnily enough, the MBA was, so far, the only device I ever had such issues with... no idea why my body was rejecting it so "violently" ).
The only impression I can agree to is point a) ( all the other point are either far fetched, false or extremely subjective - I do understand it's an impression, but the way you're exaggerating about certain things makes the other points feel more like a "this is fact, because I say it so" than an impression ), the MBA does indeed seem to be better at creating a "much lighter than it is" feeling due to its design. That being said, the 13" rMBP is far from bad and personally, I like its form more than the MBA's... I tend to use the notebook on my lap 99% of the time and for whatever reason, I find that the MBA simply doesn't feel as good / comfortable in my lap for extended periods of time. Perhaps my posture is just bad, but my neck and eyes definitely appreciates the 13" rMBP more.

lol....
My Conclusion On This Thread:
I have to say, after reading the comments in this thread... I am now
upset that I had such a bad experience (!) ... it is obvious from things written here, chatting with Queen6 privately, that there must have been some serious flaw with the computer I had received.. I would not have even attempted posting a thread had I got the sense that something was really amiss with the laptop (serious defect).
Truth be told, I was initially concerned about the "No Wifi Hardware Installed" error I got twice.. and was more worried of having to deal with this issue over and over again - so wanted a new replacement computer from the start. My observations were coming from the point of view (really) of just someone observing "nuances" and "nuisances" ... not real obvious and outright performance problems.
All this culminated with (what I can only hope was) rare, crappy service dealings with Applecare "review" processes... and I just decided "enough" , time to return.
Arrrrggggh :
HOWEVER, after reading the posts here, especially from
Queen6,
Barna Brio, and
Vickar amongst others... it is obvious that I had much more serious issues going on with my rMBP than I was aware of. I still will be returning the laptop.. its one of those "once the ship has sailed" kind of moments for me.
So, I guess I lost out on a really good/positive laptop purchase experience...
MBA vs rMBP:
I did not want this to turn into a MBA vs rMBP debate.. I am partly responsible though.
I do hope someone coming from a MBA, would read my comments - and help them better inform what things might be relevant for them.
Also, I think it was good to get the (passionate) perspective of rMBP owners... at the end of the day, it is going to be your own subjective opinion that matters in steering you to one or the other... or variation within the lineup.